diff --git a/static/shared/breadcrumb/breadcrumb.css b/static/shared/breadcrumb/breadcrumb.css
new file mode 100644
index 0000000..42f8dd3
--- /dev/null
+++ b/static/shared/breadcrumb/breadcrumb.css
@@ -0,0 +1,26 @@
+/*!
+ * Copyright 2021 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+.go-Breadcrumb ol {
+  line-height: 1.5rem;
+  white-space: initial;
+}
+.go-Breadcrumb li {
+  align-items: center;
+  color: var(--color-text-subtle);
+  display: inline-flex;
+  font-size: 0.875rem;
+}
+.go-Breadcrumb li:not(:last-child)::after {
+  content: '>';
+  padding: 0 0.5rem;
+}
+.go-Breadcrumb li:last-child > a {
+  color: var(--color-text-subtle);
+}
+.go-Breadcrumb li > .go-Clipboard {
+  margin: 0 0.5rem;
+}
diff --git a/static/shared/breadcrumb/breadcrumb.md b/static/shared/breadcrumb/breadcrumb.md
new file mode 100644
index 0000000..0d69bac
--- /dev/null
+++ b/static/shared/breadcrumb/breadcrumb.md
@@ -0,0 +1,30 @@
+## Breadcrumbs
+
+---
+
+```html
+<nav class="go-Breadcrumb" aria-label="Breadcrumb">
+  <ol>
+    <li><a href="#" data-gtmc="breadcrumb link">Discover Packages</a></li>
+    <li><a href="#" data-gtmc="breadcrumb link">Standard Library</a></li>
+    <li><a href="#" data-gtmc="breadcrumb link">net</a></li>
+    <li>
+      <a href="#" data-gtmc="breadcrumb link" aria-current="location">http</a>
+      <button
+        class="go-Button go-Button--inline go-Clipboard js-clipboard"
+        aria-label="Copy Path to Clipboard"
+        data-to-copy="hello"
+        data-gtmc="clipboard button"
+      >
+        <img
+          class="go-Icon go-Icon--accented"
+          height="24"
+          width="24"
+          src="/static/shared/icon/content_copy_gm_grey_24dp.svg"
+          alt=""
+        />
+      </button>
+    </li>
+  </ol>
+</nav>
+```
diff --git a/static/shared/button/button.css b/static/shared/button/button.css
new file mode 100644
index 0000000..0a2f5bf
--- /dev/null
+++ b/static/shared/button/button.css
@@ -0,0 +1,86 @@
+/*!
+ * Copyright 2021 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+button:focus:not([disabled]) {
+  border-color: var(--color-brand-primary);
+  -webkit-box-shadow: var(--focus-box-shadow);
+  box-shadow: var(--focus-box-shadow);
+  outline: transparent;
+}
+
+.go-Button {
+  align-items: center;
+  background-color: var(--color-button);
+  border: 0.0625rem solid transparent;
+  border-radius: var(--border-radius);
+  color: var(--color-button-text);
+  cursor: pointer;
+  display: inline-flex;
+  font-weight: 500;
+  gap: 0.25rem;
+}
+.go-Button:not(.go-Button--inline) {
+  padding: 0.5rem;
+}
+
+.go-Button--accented {
+  background-color: var(--color-button-accented);
+  color: var(--color-button-accented-text);
+}
+.go-Button--inverted,
+.go-Button--text,
+.go-Button--inline {
+  background-color: var(--color-button-inverted);
+  color: var(--color-button-inverted-text);
+}
+.go-Button--inline {
+  background-color: transparent;
+}
+
+.go-Button--inverted {
+  border: var(--border);
+}
+
+.go-Button:hover {
+  box-shadow: var(--focus-box-shadow);
+  filter: contrast(0.95);
+}
+.go-Button--inline:hover {
+  box-shadow: none;
+  text-decoration: underline var(--color-button-inverted-text);
+}
+.go-Button:focus {
+  filter: contrast(0.95);
+}
+.go-Button--inverted:focus {
+  border-color: var(--color-button-inverted-text);
+}
+.go-Button:active {
+  box-shadow: none;
+  filter: contrast(0.85);
+}
+
+.go-Button:disabled {
+  background-color: var(--color-button-disabled);
+  box-shadow: none;
+  color: var(--color-button-text-disabled);
+  cursor: initial;
+  filter: none;
+  text-decoration: none;
+}
+.go-Button--accented:disabled {
+  background-color: var(--color-button-accented-disabled);
+  color: var(--color-button-accented-text-disabled);
+}
+.go-Button--inverted:disabled,
+.go-Button--text:disabled,
+.go-Button--inline:disabled {
+  background-color: var(--color-button-inverted-disabled);
+  color: var(--color-button-inverted-text-disabled);
+}
+.go-Button--inline:disabled {
+  background-color: transparent;
+}
diff --git a/static/shared/button/button.md b/static/shared/button/button.md
new file mode 100644
index 0000000..36800b8
--- /dev/null
+++ b/static/shared/button/button.md
@@ -0,0 +1,53 @@
+## Buttons
+
+---
+
+### Primary {#button-primary}
+
+```html
+<button class="go-Button">Primary</button>
+```
+
+```html
+<button class="go-Button" disabled>Primary</button>
+```
+
+### Inverted {#button-inverted}
+
+```html
+<button class="go-Button go-Button--inverted">Inverted</button>
+```
+
+```html
+<button class="go-Button go-Button--inverted" disabled>Inverted</button>
+```
+
+### Accented {#button-accented}
+
+```html
+<button class="go-Button go-Button--accented">Accented</button>
+```
+
+```html
+<button class="go-Button go-Button--accented" disabled>Accented</button>
+```
+
+### Text {#button-text}
+
+```html
+<button class="go-Button go-Button--text">Text</button>
+```
+
+```html
+<button class="go-Button go-Button--text" disabled>Text</button>
+```
+
+### Inline {#button-inline}
+
+```html
+<button class="go-Button go-Button--inline">Inline</button>
+```
+
+```html
+<button class="go-Button go-Button--inline" disabled>Inline</button>
+```
diff --git a/static/shared/carousel/carousel.css b/static/shared/carousel/carousel.css
new file mode 100644
index 0000000..1c454e2
--- /dev/null
+++ b/static/shared/carousel/carousel.css
@@ -0,0 +1,73 @@
+/*!
+ * Copyright 2021 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+.go-Carousel {
+  align-items: center;
+  display: flex;
+  flex-direction: column;
+  position: relative;
+  text-align: center;
+}
+.go-Carousel-slide {
+  margin: 0.5rem 3rem;
+}
+.go-Carousel-slide[aria-hidden] {
+  display: none;
+}
+.go-Carousel-prevSlide {
+  left: 0;
+}
+.go-Carousel-nextSlide {
+  right: 0;
+}
+.go-Carousel-prevSlide,
+.go-Carousel-nextSlide {
+  background-color: transparent;
+  border-radius: var(--border-radius);
+  font-size: 1.5rem;
+  height: 2.75rem;
+  margin-top: -1.375rem;
+  opacity: 0;
+  position: absolute;
+  top: 50%;
+  width: 2.75rem;
+}
+.go-Carousel-prevSlide:hover,
+.go-Carousel-nextSlide:hover {
+  background-color: var(--color-background-accented);
+  cursor: pointer;
+}
+.go-Carousel:hover .go-Carousel-prevSlide,
+.go-Carousel:hover .go-Carousel-nextSlide,
+.go-Carousel:focus-within .go-Carousel-prevSlide,
+.go-Carousel:focus-within .go-Carousel-nextSlide {
+  opacity: 1;
+}
+.go-Carousel-dots {
+  display: flex;
+  font-size: 0.4375rem;
+  gap: 0.5rem;
+}
+.go-Carousel-dot {
+  background-color: var(--color-border);
+  border-radius: 2rem;
+  height: 0.4375rem;
+  width: 0.4375rem;
+}
+.go-Carousel-dot--active,
+.go-Carousel-dot:hover {
+  background-color: var(--color-text-subtle);
+}
+.go-Carousel-obscured {
+  border: 0;
+  clip: rect(0 0 0 0);
+  height: 0.0625rem;
+  margin: -0.0625rem;
+  overflow: hidden;
+  padding: 0;
+  position: absolute;
+  width: 0.0625rem;
+}
diff --git a/static/shared/carousel/carousel.md b/static/shared/carousel/carousel.md
new file mode 100644
index 0000000..03bf45d
--- /dev/null
+++ b/static/shared/carousel/carousel.md
@@ -0,0 +1,42 @@
+## Carousel
+
+---
+
+### With Heading
+
+```html
+<section class="go-Carousel js-carousel" data-slide-index="0">
+  <h5>Search Tips</h2>
+  <ul>
+    <li class="go-Carousel-slide">
+      <p>Search for a package by name, for example “logrus”</p>
+    </li>
+    <li class="go-Carousel-slide" aria-hidden>
+      <p>Search for a symbol by name, for example "sql.DB"</p>
+    </li>
+    <li class="go-Carousel-slide" aria-hidden>
+      <p>Search for a symbol in a path, for example "#error golang.org/x"</p>
+    </li>
+  </ul>
+</section>
+```
+
+### Aria Label
+
+Use aria-label to create an accessible label that is visually hidden.
+
+```html
+<section class="go-Carousel js-carousel" aria-label="Search Tips Carousel" data-slide-index="0">
+  <ul>
+    <li class="go-Carousel-slide">
+      <p>Search for a package by name, for example “logrus”</p>
+    </li>
+    <li class="go-Carousel-slide" aria-hidden>
+      <p>Search for a symbol by name, for example "sql.DB"</p>
+    </li>
+    <li class="go-Carousel-slide" aria-hidden>
+      <p>Search for a symbol in a path, for example "#error golang.org/x"</p>
+    </li>
+  </ul>
+</section>
+```
diff --git a/static/shared/carousel/carousel.test.ts b/static/shared/carousel/carousel.test.ts
new file mode 100644
index 0000000..b62b799
--- /dev/null
+++ b/static/shared/carousel/carousel.test.ts
@@ -0,0 +1,73 @@
+/**
+ * @license
+ * Copyright 2021 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+import { parse } from '../../markdown';
+import { CarouselController } from './carousel';
+
+describe('Tooltip', () => {
+  let carousel: HTMLDetailsElement;
+  let prevArrow: HTMLButtonElement;
+  let nextArrow: HTMLButtonElement;
+  let dots: HTMLElement[];
+  let slides: HTMLElement[];
+  let liveRegion: HTMLElement;
+
+  beforeEach(async () => {
+    document.body.innerHTML = await parse(__dirname + '/carousel.md');
+    carousel = document.querySelector('.js-carousel');
+    new CarouselController(carousel);
+    prevArrow = carousel.querySelector('.go-Carousel-prevSlide');
+    nextArrow = carousel.querySelector('.go-Carousel-nextSlide');
+    dots = Array.from(carousel.querySelectorAll('.go-Carousel-dot'));
+    slides = Array.from(carousel.querySelectorAll('.go-Carousel-slide'));
+    liveRegion = carousel.querySelector('[aria-live]');
+  });
+
+  afterEach(() => {
+    document.body.innerHTML = '';
+  });
+
+  it('generates arrows, dots, and live region', () => {
+    expect(prevArrow).toBeDefined();
+    expect(nextArrow).toBeDefined();
+    expect(dots).toBeDefined();
+    expect(liveRegion).toBeDefined();
+  });
+
+  it('shows only the first slide', () => {
+    expect(slides[0].getAttribute('aria-hidden')).toBeFalsy();
+    expect(slides[1].getAttribute('aria-hidden')).toBeTruthy();
+    expect(slides[2].getAttribute('aria-hidden')).toBeTruthy();
+  });
+
+  it('shows next slide on next arrow click', () => {
+    nextArrow.click();
+    expect(slides[0].getAttribute('aria-hidden')).toBeTruthy();
+    expect(slides[1].getAttribute('aria-hidden')).toBeFalsy();
+    expect(slides[2].getAttribute('aria-hidden')).toBeTruthy();
+  });
+
+  it('shows prev slide on prev arrow click', () => {
+    prevArrow.click();
+    expect(slides[0].getAttribute('aria-hidden')).toBeTruthy();
+    expect(slides[1].getAttribute('aria-hidden')).toBeTruthy();
+    expect(slides[2].getAttribute('aria-hidden')).toBeFalsy();
+  });
+
+  it('sets active slide on dot click', () => {
+    dots[1].click();
+    expect(slides[0].getAttribute('aria-hidden')).toBeTruthy();
+    expect(slides[1].getAttribute('aria-hidden')).toBeFalsy();
+    expect(slides[2].getAttribute('aria-hidden')).toBeTruthy();
+  });
+
+  it('updates live region', () => {
+    expect(liveRegion.textContent).toContain('Slide 1 of 3');
+    dots[1].click();
+    expect(liveRegion.textContent).toContain('Slide 2 of 3');
+  });
+});
diff --git a/static/shared/carousel/carousel.ts b/static/shared/carousel/carousel.ts
new file mode 100644
index 0000000..d311e4e
--- /dev/null
+++ b/static/shared/carousel/carousel.ts
@@ -0,0 +1,116 @@
+/**
+ * @license
+ * Copyright 2021 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+/**
+ * Carousel Controller adds event listeners, accessibility enhancements, and
+ * control elements to a carousel component.
+ */
+export class CarouselController {
+  /**
+   * slides is a collection of slides in the carousel.
+   */
+  private slides: HTMLLIElement[];
+  /**
+   * dots is a collection of dot navigation controls, added to the carousel
+   * by this controller.
+   */
+  private dots: HTMLElement[];
+  /**
+   * liveRegion is a visually hidden element that notifies assitive devices
+   * of visual changes to the carousel. They are added to the carousel by
+   * this controller.
+   */
+  private liveRegion: HTMLElement;
+  /**
+   * activeIndex is the 0-index of the currently active slide.
+   */
+  private activeIndex: number;
+
+  constructor(private el: HTMLElement) {
+    this.slides = Array.from(el.querySelectorAll('.go-Carousel-slide'));
+    this.dots = [];
+    this.liveRegion = document.createElement('div');
+    this.activeIndex = Number(el.getAttribute('data-slide-index') ?? 0);
+
+    this.initSlides();
+    this.initArrows();
+    this.initDots();
+    this.initLiveRegion();
+  }
+
+  private initSlides() {
+    for (const [i, v] of this.slides.entries()) {
+      if (i === this.activeIndex) continue;
+      v.setAttribute('aria-hidden', 'true');
+    }
+  }
+
+  private initArrows() {
+    const arrows = document.createElement('ul');
+    arrows.classList.add('go-Carousel-arrows');
+    arrows.innerHTML = `
+      <li>
+        <button class="go-Carousel-prevSlide" aria-label="Go to previous slide">
+          <img class="go-Icon" height="24" width="24" src="/static/shared/icon/arrow_left_gm_grey_24dp.svg" alt="">
+        </button>
+      </li>
+      <li>
+        <button class="go-Carousel-nextSlide" aria-label="Go to next slide">
+          <img class="go-Icon" height="24" width="24" src="/static/shared/icon/arrow_right_gm_grey_24dp.svg" alt="">
+        </button>
+      </li>
+    `;
+    arrows
+      .querySelector('.go-Carousel-prevSlide')
+      ?.addEventListener('click', () => this.setActive(this.activeIndex - 1));
+    arrows
+      .querySelector('.go-Carousel-nextSlide')
+      ?.addEventListener('click', () => this.setActive(this.activeIndex + 1));
+    this.el.append(arrows);
+  }
+
+  private initDots() {
+    const dots = document.createElement('ul');
+    dots.classList.add('go-Carousel-dots');
+    for (let i = 0; i < this.slides.length; i++) {
+      const li = document.createElement('li');
+      const button = document.createElement('button');
+      button.classList.add('go-Carousel-dot');
+      if (i === this.activeIndex) {
+        button.classList.add('go-Carousel-dot--active');
+      }
+      button.innerHTML = `<span class="go-Carousel-obscured">Slide ${i + 1}</span>`;
+      button.addEventListener('click', () => this.setActive(i));
+      li.append(button);
+      dots.append(li);
+      this.dots.push(button);
+    }
+    this.el.append(dots);
+  }
+
+  private initLiveRegion() {
+    this.liveRegion.setAttribute('aria-live', 'polite');
+    this.liveRegion.setAttribute('aria-atomic', 'true');
+    this.liveRegion.setAttribute('class', 'go-Carousel-obscured');
+    this.liveRegion.textContent = `Slide ${this.activeIndex + 1} of ${this.slides.length}`;
+    this.el.appendChild(this.liveRegion);
+  }
+
+  private setActive = (index: number) => {
+    this.activeIndex = (index + this.slides.length) % this.slides.length;
+    this.el.setAttribute('data-slide-index', String(this.activeIndex));
+    for (const d of this.dots) {
+      d.classList.remove('go-Carousel-dot--active');
+    }
+    this.dots[this.activeIndex].classList.add('go-Carousel-dot--active');
+    for (const s of this.slides) {
+      s.setAttribute('aria-hidden', 'true');
+    }
+    this.slides[this.activeIndex].removeAttribute('aria-hidden');
+    this.liveRegion.textContent = 'Slide ' + (this.activeIndex + 1) + ' of ' + this.slides.length;
+  };
+}
diff --git a/static/shared/chip/chip.css b/static/shared/chip/chip.css
new file mode 100644
index 0000000..6681cba
--- /dev/null
+++ b/static/shared/chip/chip.css
@@ -0,0 +1,44 @@
+/*!
+ * Copyright 2021 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+.go-Chip {
+  background: var(--color-button);
+  border: 0.0625rem solid var(--color-button);
+  border-radius: 1.25rem;
+  color: var(--color-button-text);
+  font-size: 0.75rem;
+  padding: 0.125rem 0.625rem;
+}
+.go-Chip--accented {
+  background: var(--color-button-accented);
+  border: 0.0625rem solid var(--color-button-accented);
+  color: var(--color-button-accented-text);
+}
+.go-Chip--inverted {
+  background: var(--color-button-inverted);
+  border: var(--border);
+  color: var(--color-text);
+}
+.go-Chip--highlighted {
+  background: var(--color-background-highlighted-link);
+  border-color: var(--color-background-highlighted-link);
+  color: var(--color-brand-primary);
+}
+.go-Chip--alert {
+  background: var(--pink);
+  border: 0.0625rem solid var(--pink);
+  color: var(--color-text-inverted);
+}
+.go-Chip--vuln {
+  background: var(--pink-light);
+  border: 0.0625rem solid var(--pink-light);
+  color: var(--color-text-inverted);
+}
+.go-Chip--subtle {
+  background-color: var(--color-background-accented);
+  border-color: transparent;
+  color: var(--color-text-subtle);
+}
diff --git a/static/shared/chip/chip.md b/static/shared/chip/chip.md
new file mode 100644
index 0000000..27bb63b
--- /dev/null
+++ b/static/shared/chip/chip.md
@@ -0,0 +1,27 @@
+## Chips
+
+---
+
+```html #chip-primary
+<span class="go-Chip">Primary</span>
+```
+
+```html #chip-inverted
+<span class="go-Chip go-Chip--inverted">Inverted</span>
+```
+
+```html #chip-highlighted
+<span class="go-Chip go-Chip--highlighted">Highlighted</span>
+```
+
+```html #chip-warning
+<span class="go-Chip go-Chip--accented">Warning</span>
+```
+
+```html #chip-alert
+<span class="go-Chip go-Chip--alert">Alert</span>
+```
+
+```html #chip-subtle
+<span class="go-Chip go-Chip--subtle">Subtle</span>
+```
diff --git a/static/shared/clipboard/clipboard.css b/static/shared/clipboard/clipboard.css
new file mode 100644
index 0000000..6408d71
--- /dev/null
+++ b/static/shared/clipboard/clipboard.css
@@ -0,0 +1,42 @@
+/*!
+ * Copyright 2021 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+.go-Clipboard {
+  position: relative;
+}
+.go-Clipboard::before {
+  background-color: var(--color-background-inverted);
+  border-radius: var(--border-radius);
+  color: var(--color-text-inverted);
+  content: attr(data-tooltip);
+  display: block;
+  font-size: 0.9em;
+  left: calc(100% + 0.125rem);
+  padding: 0.25rem 0.3rem;
+  position: absolute;
+  text-transform: uppercase;
+  top: 0.125rem;
+  white-space: nowrap;
+  z-index: 1000;
+}
+.go-Clipboard::after {
+  border-bottom: 0.25rem solid transparent;
+  border-left: 0;
+  border-right: 0.25rem solid var(--color-background-inverted);
+  border-top: 0.25rem solid transparent;
+  content: '';
+  display: block;
+  position: absolute;
+  right: -0.125rem;
+  top: 0.5625rem;
+  z-index: 1000;
+}
+.go-Clipboard:not([data-tooltip])::before,
+.go-Clipboard:not([data-tooltip])::after,
+.go-Clipboard[data-tooltip='']::before,
+.go-Clipboard[data-tooltip='']::after {
+  display: none;
+}
diff --git a/static/shared/clipboard/clipboard.md b/static/shared/clipboard/clipboard.md
new file mode 100644
index 0000000..31fe29f
--- /dev/null
+++ b/static/shared/clipboard/clipboard.md
@@ -0,0 +1,62 @@
+## Clipboard
+
+---
+
+Use an aria-label on buttons to provide context about the data being copied.
+
+### Button {#clipboard-button}
+
+```html
+<button
+  class="go-Button go-Button--inline go-Clipboard js-clipboard"
+  data-to-copy="hello, world!"
+  aria-label="Copy _DATA_ to Clipboard"
+  data-gtmc="clipboard button"
+>
+  <img
+    class="go-Icon"
+    height="24"
+    width="24"
+    src="/static/shared/icon/content_copy_gm_grey_24dp.svg"
+    alt=""
+  />
+</button>
+```
+
+```html
+<button
+  class="go-Button go-Button--inverted go-Clipboard js-clipboard"
+  data-to-copy="hello, world!"
+  aria-label="Copy _DATA_ to Clipboard"
+  data-gtmc="clipboard button"
+>
+  <img
+    class="go-Icon"
+    height="24"
+    width="24"
+    src="/static/shared/icon/content_copy_gm_grey_24dp.svg"
+    alt=""
+  />
+</button>
+```
+
+### Input {#clipboard-input}
+
+```html
+<div class="go-InputGroup">
+  <input class="go-Input" value="hello, world!" readonly />
+  <button
+    class="go-Button go-Button--inverted go-Clipboard js-clipboard"
+    aria-label="Copy to Clipboard"
+    data-gtmc="clipboard button"
+  >
+    <img
+      class="go-Icon"
+      height="24"
+      width="24"
+      src="/static/shared/icon/content_copy_gm_grey_24dp.svg"
+      alt=""
+    />
+  </button>
+</div>
+```
diff --git a/static/shared/clipboard/clipboard.test.ts b/static/shared/clipboard/clipboard.test.ts
new file mode 100644
index 0000000..33729ff
--- /dev/null
+++ b/static/shared/clipboard/clipboard.test.ts
@@ -0,0 +1,48 @@
+/**
+ * @license
+ * Copyright 2021 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+import { parse } from '../../markdown';
+import { ClipboardController } from './clipboard';
+
+describe('ClipboardController', () => {
+  const buttons: HTMLButtonElement[] = [];
+  const controllers: ClipboardController[] = [];
+  const dataToCopy = 'hello, world!';
+
+  beforeAll(async () => {
+    document.body.innerHTML = await parse(__dirname + '/clipboard.md');
+    for (const button of document.querySelectorAll<HTMLButtonElement>('.js-clipboard')) {
+      buttons.push(button);
+      controllers.push(new ClipboardController(button));
+    }
+  });
+
+  afterAll(() => {
+    document.body.innerHTML = '';
+  });
+
+  it('copys data-to-copy when clicked', () => {
+    Object.assign(navigator, { clipboard: { writeText: () => Promise.resolve() } });
+    jest.spyOn(navigator.clipboard, 'writeText');
+    buttons[0].click();
+    expect(navigator.clipboard.writeText).toHaveBeenCalledWith(dataToCopy);
+  });
+
+  it('copys input value when clicked', () => {
+    Object.assign(navigator, { clipboard: { writeText: () => Promise.resolve() } });
+    jest.spyOn(navigator.clipboard, 'writeText');
+    buttons[2].click();
+    expect(navigator.clipboard.writeText).toHaveBeenCalledWith(dataToCopy);
+  });
+
+  it('shows error when clicked if clipboard is undefined', () => {
+    Object.assign(navigator, { clipboard: undefined });
+    jest.spyOn(controllers[1], 'showTooltipText');
+    buttons[1].click();
+    expect(controllers[1].showTooltipText).toHaveBeenCalledWith('Unable to copy', 1000);
+  });
+});
diff --git a/static/shared/clipboard/clipboard.ts b/static/shared/clipboard/clipboard.ts
new file mode 100644
index 0000000..0afa223
--- /dev/null
+++ b/static/shared/clipboard/clipboard.ts
@@ -0,0 +1,61 @@
+/**
+ * @license
+ * Copyright 2021 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+/**
+ * This class decorates an element to copy arbitrary data attached via a data-
+ * attribute to the clipboard.
+ */
+export class ClipboardController {
+  /**
+   * The data to be copied to the clipboard.
+   */
+  private data: string;
+
+  /**
+   * @param el The element that will trigger copying text to the clipboard. The text is
+   * expected to be within its data-to-copy attribute.
+   */
+  constructor(private el: HTMLButtonElement) {
+    this.data = el.dataset['toCopy'] ?? el.innerText;
+    // if data-to-copy is empty and the button is part of an input group
+    // capture the value of the input.
+    if (!this.data && el.parentElement?.classList.contains('go-InputGroup')) {
+      this.data = (this.data || el.parentElement?.querySelector('input')?.value) ?? '';
+    }
+    el.addEventListener('click', e => this.handleCopyClick(e));
+  }
+
+  /**
+   * Handles when the primary element is clicked.
+   */
+  handleCopyClick(e: MouseEvent): void {
+    e.preventDefault();
+    const TOOLTIP_SHOW_DURATION_MS = 1000;
+
+    // This API is not available on iOS.
+    if (!navigator.clipboard) {
+      this.showTooltipText('Unable to copy', TOOLTIP_SHOW_DURATION_MS);
+      return;
+    }
+    navigator.clipboard
+      .writeText(this.data)
+      .then(() => {
+        this.showTooltipText('Copied!', TOOLTIP_SHOW_DURATION_MS);
+      })
+      .catch(() => {
+        this.showTooltipText('Unable to copy', TOOLTIP_SHOW_DURATION_MS);
+      });
+  }
+
+  /**
+   * Shows the given text in a tooltip for a specified amount of time, in milliseconds.
+   */
+  showTooltipText(text: string, durationMs: number): void {
+    this.el.setAttribute('data-tooltip', text);
+    setTimeout(() => this.el.setAttribute('data-tooltip', ''), durationMs);
+  }
+}
diff --git a/static/shared/color/color-intent.md b/static/shared/color/color-intent.md
new file mode 100644
index 0000000..a7f9eb9
--- /dev/null
+++ b/static/shared/color/color-intent.md
@@ -0,0 +1,115 @@
+## Color Intents
+
+---
+
+### Brand {#color-intent-brand}
+
+<span style="display:contents;">
+  <go-color id="--color-brand-primary"></go-color>
+</span>
+
+### Background {#color-intent-background}
+
+<span style="display:contents;">
+  <go-color id="--color-background"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--color-background-inverted"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--color-background-accented"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--color-background-highlighted"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--color-background-warning"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--color-background-alert"></go-color>
+</span>
+
+### Border {#color-intent-border}
+
+<span style="display:contents;">
+  <go-color id="--color-border"></go-color>
+</span>
+
+### Text {#color-intent-text}
+
+<span style="display:contents;">
+  <go-color id="--color-text"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--color-text-subtle"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--color-text-inverted"></go-color>
+</span>
+
+### Input {#color-intent-input}
+
+<span style="display:contents;">
+  <go-color id="--color-input"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--color-input-text"></go-color>
+</span>
+
+### Button {#color-intent-button}
+
+<span style="display:contents;">
+  <go-color id="--color-button"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--color-button-disabled"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--color-button-text"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--color-button-text-disabled"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--color-button-inverted"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--color-button-inverted-disabled"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--color-button-inverted-text"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--color-button-inverted-text-disabled"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--color-button-accented"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--color-button-accented-disabled"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--color-button-accented-text"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--color-button-accented-text-disabled"></go-color>
+</span>
diff --git a/static/shared/color/color.css b/static/shared/color/color.css
new file mode 100644
index 0000000..bc7554a
--- /dev/null
+++ b/static/shared/color/color.css
@@ -0,0 +1,66 @@
+/*!
+ * Copyright 2021 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+:root {
+  /* Colors */
+  --gray-1: #202224;
+  --gray-2: #3e4042;
+  --gray-3: #555759;
+  --gray-4: #6e7072;
+  --gray-5: #848688;
+  --gray-6: #aaacae;
+  --gray-7: #c6c8ca;
+  --gray-8: #dcdee0;
+  --gray-9: #f0f1f2;
+  --gray-10: #f8f8f8;
+  --turq-light: #5dc9e2;
+  --turq-med: #50b7e0;
+  --turq-dark: #007d9c;
+  --blue: #bfeaf4;
+  --blue-light: #f2fafd;
+  --black: #000;
+  --green: #3a6e11;
+  --green-light: #5fda64;
+  --pink: #c85e7a;
+  --pink-light: #fdecf1;
+  --purple: #542c7d;
+  --slate: #253443; /* Footer background. */
+  --white: #fff;
+  --yellow: #fceea5;
+  --yellow-light: #fff8cc;
+
+  /* Color Intents */
+  --color-brand-primary: var(--turq-dark);
+  --color-background: var(--white);
+  --color-background-inverted: var(--slate);
+  --color-background-accented: var(--gray-10);
+  --color-background-highlighted: var(--blue);
+  --color-background-highlighted-link: var(--blue-light);
+  --color-background-info: var(--gray-9);
+  --color-background-warning: var(--yellow-light);
+  --color-background-alert: var(--pink-light);
+  --color-border: var(--gray-7);
+  --color-text: var(--gray-1);
+  --color-text-subtle: var(--gray-4);
+  --color-text-inverted: var(--white);
+  --color-code-comment: var(--green);
+
+  /* Interactive Colors */
+  --color-input: var(--color-background);
+  --color-input-text: var(--color-text);
+  --color-button: var(--turq-dark);
+  --color-button-disabled: var(--gray-9);
+  --color-button-text: var(--white);
+  --color-button-text-disabled: var(--gray-3);
+  --color-button-inverted: var(--color-background);
+  --color-button-inverted-disabled: var(--color-background);
+  --color-button-inverted-text: var(--color-brand-primary);
+  --color-button-inverted-text-disabled: var(--color-text-subtle);
+  --color-button-accented: var(--yellow);
+  --color-button-accented-disabled: var(--gray-9);
+  --color-button-accented-text: var(--gray-1);
+  --color-button-accented-text-disabled: var(--gray-3);
+}
diff --git a/static/shared/color/color.md b/static/shared/color/color.md
new file mode 100644
index 0000000..73fb5fc
--- /dev/null
+++ b/static/shared/color/color.md
@@ -0,0 +1,116 @@
+## Colors
+
+---
+
+Prefer the use of Color Intent over Color variables where possible. Color Intents are themed and
+adjust for dark mode.
+
+### Gray {#colors-gray}
+
+<span style="display:contents;">
+  <go-color id="--gray-1"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--gray-2"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--gray-3"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--gray-4"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--gray-5"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--gray-6"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--gray-7"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--gray-8"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--gray-9"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--gray-10"></go-color>
+</span>
+
+### Brand {#colors-brand}
+
+<span style="display:contents;">
+  <go-color id="--turq-light"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--turq-med"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--turq-dark"></go-color>
+</span>
+
+### Other {#colors-other}
+
+<span style="display:contents;">
+  <go-color id="--blue"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--blue-light"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--black"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--green"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--green-light"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--pink"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--pink-light"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--purple"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--purple-light"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--slate"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--white"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--yellow"></go-color>
+</span>
+
+<span style="display:contents;">
+  <go-color id="--yellow-light"></go-color>
+</span>
diff --git a/static/shared/form/form.css b/static/shared/form/form.css
new file mode 100644
index 0000000..4df4de2
--- /dev/null
+++ b/static/shared/form/form.css
@@ -0,0 +1,116 @@
+/*!
+ * Copyright 2021 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+select:focus:not([disabled]),
+input:focus:not([disabled]) {
+  border-color: var(--color-brand-primary);
+  -webkit-box-shadow: var(--focus-box-shadow);
+  box-shadow: var(--focus-box-shadow);
+  outline: transparent;
+  z-index: 2;
+}
+
+input::placeholder {
+  color: var(--color-text-subtle);
+}
+
+.go-Form {
+  align-items: start;
+  display: flex;
+  flex-direction: column;
+  gap: 1rem;
+}
+
+.go-Label {
+  display: flex;
+  flex-direction: column;
+  gap: 0.5rem;
+}
+.go-Label--inline {
+  align-items: center;
+  flex-direction: row;
+}
+.go-Label legend {
+  margin-bottom: 0.5rem;
+}
+.go-Label--inline legend {
+  float: left;
+  margin-bottom: 0;
+}
+.go-Input,
+.go-Select {
+  background: var(--color-input);
+  border: var(--border);
+  border-radius: var(--border-radius);
+  color: var(--color-input-text);
+}
+.go-Input {
+  padding: 0.40625rem 0.5rem;
+}
+.go-Select {
+  -webkit-appearance: none;
+  -moz-appearance: none;
+  appearance: none;
+  background: url('/static/shared/icon/arrow_drop_down_gm_grey_24dp.svg') right no-repeat;
+  background-color: var(--color-background);
+  background-position: right center;
+  border-radius: var(--border-radius);
+  margin: 0;
+  padding: 0.34375rem 1.25rem 0.34375rem 0.5rem;
+}
+
+.go-InputGroup {
+  display: flex;
+}
+.go-InputGroup .go-Input {
+  flex: 1;
+}
+.go-InputGroup > :not(:first-child, :last-child) {
+  border-radius: 0;
+  margin-left: -0.0625rem;
+}
+.go-InputGroup > :first-child {
+  border-bottom-right-radius: 0;
+  border-top-right-radius: 0;
+}
+.go-InputGroup > :last-child {
+  border-bottom-left-radius: 0;
+  border-top-left-radius: 0;
+  margin-left: -0.0625rem;
+}
+.go-InputGroup > *:hover,
+.go-InputGroup > *:focus {
+  z-index: 1;
+}
+
+.go-ShortcutKey {
+  display: flex;
+  position: relative;
+}
+.go-ShortcutKey .go-Input {
+  flex-grow: 1;
+}
+.go-ShortcutKey::after {
+  align-self: center;
+  background-color: var(--color-background-accented);
+  border-radius: 0.5rem;
+  color: var(--gray-6);
+  content: attr(data-shortcut);
+  content: attr(data-shortcut) / attr(data-shortcut-alt);
+  display: none;
+  font-size: 0.75rem;
+  padding: 0.0625rem 0;
+  position: absolute;
+  right: 0.75rem;
+  text-align: center;
+  width: 1.5rem;
+  z-index: 1;
+}
+@media only screen and (min-width: 52rem) {
+  .go-ShortcutKey::after {
+    display: initial;
+  }
+}
diff --git a/static/shared/form/form.md b/static/shared/form/form.md
new file mode 100644
index 0000000..936c587
--- /dev/null
+++ b/static/shared/form/form.md
@@ -0,0 +1,128 @@
+## Forms
+
+---
+
+### Input {#form-input}
+
+```html
+<input class="go-Input" placeholder="Placeholder text" />
+```
+
+### Input w/ Label {#form-input-label}
+
+```html
+<label class="go-Label">
+  URL
+  <input class="go-Input" placeholder="e.g., https://pkg.go.dev/net/http" />
+</label>
+```
+
+### Input w/ Shortcut Key {#form-input-shortcut}
+
+```html
+<div class="go-ShortcutKey" data-shortcut="/" data-shortcut-alt="search">
+  <input class="go-Input" placeholder="e.g., https://pkg.go.dev/net/http" />
+</div>
+```
+
+### Select w/ Inline Label {#form-select}
+
+```html
+<label class="go-Label go-Label--inline">
+  Rendered for
+  <select class="go-Select">
+    <option>linux/amd64</option>
+    <option>windows/amd64</option>
+    <option>darwin/amd64</option>
+    <option>js/wasm</option>
+  </select>
+</label>
+```
+
+### Input Groups {#form-groups}
+
+```html
+<form
+  class="go-InputGroup"
+  action="#forms"
+  data-gtmc="search form"
+  aria-label="Search for a package"
+  role="search"
+>
+  <input name="q" class="go-Input" placeholder="Search for a package" />
+  <button class="go-Button go-Button--inverted" aria-label="Submit search">
+    <img
+      class="go-Icon"
+      height="24"
+      width="24"
+      src="/static/shared/icon/search_gm_grey_24dp.svg"
+      alt=""
+    />
+  </button>
+</form>
+```
+
+```html
+<form
+  class="go-InputGroup"
+  action="#forms"
+  data-gtmc="search form"
+  aria-label="Search for a package"
+  role="search"
+>
+  <input name="q" class="go-Input" placeholder="Search for a package" />
+  <button class="go-Button">Submit</button>
+</form>
+```
+
+```html
+<div class="go-InputGroup">
+  <button class="go-Button go-Button--inverted" data-gtmc="menu button" aria-label="Open menu">
+    <img
+      class="go-Icon"
+      height="24"
+      width="24"
+      src="/static/shared/icon/filter_list_gm_grey_24dp.svg"
+      alt=""
+    />
+  </button>
+  <button class="go-Button go-Button--inverted" data-gtmc="menu button">Share</button>
+  <button class="go-Button go-Button--inverted" data-gtmc="menu button">Format</button>
+  <button class="go-Button go-Button--inverted" data-gtmc="menu button">Run</button>
+  <button class="go-Button go-Button--inverted" data-gtmc="menu button" aria-label="Search">
+    <img
+      class="go-Icon"
+      height="24"
+      width="24"
+      src="/static/shared/icon/search_gm_grey_24dp.svg"
+      alt=""
+    />
+  </button>
+</div>
+```
+
+```html
+<fieldset class="go-Label go-Label--inline">
+  <legend>Label</legend>
+  <div class="go-InputGroup">
+    <button class="go-Button go-Button--inverted" data-gtmc="menu button" aria-label="Open menu">
+      <img
+        class="go-Icon"
+        height="24"
+        width="24"
+        src="/static/shared/icon/filter_list_gm_grey_24dp.svg"
+        alt=""
+      />
+    </button>
+    <button class="go-Button go-Button--inverted" data-gtmc="menu button" aria-label="Search">
+      <img
+        class="go-Icon"
+        height="24"
+        width="24"
+        src="/static/shared/icon/search_gm_grey_24dp.svg"
+        alt=""
+      />
+    </button>
+  </div>
+</fieldset>
+```
diff --git a/static/shared/gopher/airplane-1200x945.svg b/static/shared/gopher/airplane-1200x945.svg
new file mode 100644
index 0000000..275283a
--- /dev/null
+++ b/static/shared/gopher/airplane-1200x945.svg
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/static/shared/gopher/gopher.css b/static/shared/gopher/gopher.css
new file mode 100644
index 0000000..14c2644
--- /dev/null
+++ b/static/shared/gopher/gopher.css
@@ -0,0 +1,18 @@
+/*!
+ * Copyright 2020 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+.go-GopherMessage img {
+  display: block;
+  height: 15rem;
+  margin: 0 auto;
+  padding: 1.25rem 0;
+  width: 15rem;
+}
+.go-GopherMessage p {
+  font-weight: 600;
+  margin: auto;
+  text-align: center;
+}
diff --git a/static/shared/gopher/gopher.tmpl b/static/shared/gopher/gopher.tmpl
new file mode 100644
index 0000000..456b79a
--- /dev/null
+++ b/static/shared/gopher/gopher.tmpl
@@ -0,0 +1,13 @@
+<!--
+  Copyright 2021 The Go Authors. All rights reserved.
+  Use of this source code is governed by a BSD-style
+  license that can be found in the LICENSE file.
+-->
+
+{{define "gopher-airplane"}}
+  <div class="go-GopherMessage">
+    <img width="1200" height="945"src="/static/shared/gopher/airplane-1200x945.svg"
+        alt="The Go Gopher">
+    {{if .}}<p data-test-id="gopher-message">{{.}}</p>{{end}}
+  </div>
+{{end}}
diff --git a/static/shared/gopher/package-search-700x300.jpeg b/static/shared/gopher/package-search-700x300.jpeg
new file mode 100644
index 0000000..2be4db5
--- /dev/null
+++ b/static/shared/gopher/package-search-700x300.jpeg
Binary files differ
diff --git a/static/shared/gopher/pilot-bust-1431x901.svg b/static/shared/gopher/pilot-bust-1431x901.svg
new file mode 100644
index 0000000..a654dc7
--- /dev/null
+++ b/static/shared/gopher/pilot-bust-1431x901.svg
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new file mode 100644
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new file mode 100644
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+<svg xmlns="http://www.w3.org/2000/svg" height="24px" viewBox="0 0 24 24" width="24px" fill="#455A64"><path d="M0 0h24v24H0V0z" fill="none"/><path d="M10 18h4v-2h-4v2zM3 6v2h18V6H3zm3 7h12v-2H6v2z"/></svg>
\ No newline at end of file
diff --git a/static/shared/icon/folder_gm_grey_24dp.svg b/static/shared/icon/folder_gm_grey_24dp.svg
new file mode 100644
index 0000000..bcbf551
--- /dev/null
+++ b/static/shared/icon/folder_gm_grey_24dp.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" height="24px" viewBox="0 0 24 24" width="24px" fill="#455A64"><path d="M0 0h24v24H0V0z" fill="none"/><path d="M20 6h-8l-2-2H4c-1.1 0-1.99.9-1.99 2L2 18c0 1.1.9 2 2 2h16c1.1 0 2-.9 2-2V8c0-1.1-.9-2-2-2zm0 12H4V8h16v10z"/></svg>
\ No newline at end of file
diff --git a/static/shared/icon/help_gm_grey_24dp.svg b/static/shared/icon/help_gm_grey_24dp.svg
new file mode 100644
index 0000000..be81972
--- /dev/null
+++ b/static/shared/icon/help_gm_grey_24dp.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" height="24px" viewBox="0 0 24 24" width="24px" fill="#455A64"><path d="M0 0h24v24H0V0z" fill="none"/><path d="M12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm1 17h-2v-2h2v2zm2.07-7.75l-.9.92C13.45 12.9 13 13.5 13 15h-2v-.5c0-1.1.45-2.1 1.17-2.83l1.24-1.26c.37-.36.59-.86.59-1.41 0-1.1-.9-2-2-2s-2 .9-2 2H8c0-2.21 1.79-4 4-4s4 1.79 4 4c0 .88-.36 1.68-.93 2.25z"/></svg>
\ No newline at end of file
diff --git a/static/shared/icon/horizontal_split_gm_grey_24dp.svg b/static/shared/icon/horizontal_split_gm_grey_24dp.svg
new file mode 100644
index 0000000..2c9e9d2
--- /dev/null
+++ b/static/shared/icon/horizontal_split_gm_grey_24dp.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" height="24px" viewBox="0 0 24 24" width="24px" fill="#455A64"><path d="M0 0h24v24H0V0z" fill="none"/><path d="M21 5H3v2h18V5zm0 4H3v2h18V9zm0 4H3v6h18v-6z"/></svg>
\ No newline at end of file
diff --git a/static/shared/icon/icon.css b/static/shared/icon/icon.css
new file mode 100644
index 0000000..8a0c212
--- /dev/null
+++ b/static/shared/icon/icon.css
@@ -0,0 +1,26 @@
+/*!
+ * Copyright 2021 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+.depsdev-Icon {
+  height: 1.125em;
+  vertical-align: text-bottom;
+  width: auto;
+}
+
+.go-Icon {
+  filter: none;
+  height: 1.125em;
+  vertical-align: text-bottom;
+  width: auto;
+}
+.go-Icon--accented {
+  filter: brightness(0) invert(45%) sepia(94%) saturate(6735%) hue-rotate(176deg) brightness(94%)
+    contrast(101%);
+}
+.go-Icon--inverted {
+  filter: brightness(0) saturate(100%) invert(100%) sepia(97%) saturate(13%) hue-rotate(245deg)
+    brightness(103%) contrast(107%);
+}
diff --git a/static/shared/icon/icon.md b/static/shared/icon/icon.md
new file mode 100644
index 0000000..8e53dd8
--- /dev/null
+++ b/static/shared/icon/icon.md
@@ -0,0 +1,139 @@
+## Icons
+
+---
+
+<span style="display:contents;">
+  <go-icon name="alert"></go-icon>
+</span>
+
+<span style="display:contents;">
+  <go-icon name="arrow_drop_up"></go-icon>
+</span>
+
+<span style="display:contents;">
+  <go-icon name="arrow_drop_down"></go-icon>
+</span>
+
+<span style="display:contents;">
+  <go-icon name="arrow_left"></go-icon>
+</span>
+
+<span style="display:contents;">
+  <go-icon name="arrow_left_alt"></go-icon>
+</span>
+
+<span style="display:contents;">
+  <go-icon name="arrow_right"></go-icon>
+</span>
+
+<span style="display:contents;">
+  <go-icon name="arrow_right_alt"></go-icon>
+</span>
+
+<span style="display:contents;">
+  <go-icon name="brightness_2"></go-icon>
+</span>
+
+<span style="display:contents;">
+  <go-icon name="brightness_6"></go-icon>
+</span>
+
+<span style="display:contents;">
+  <go-icon name="call_split"></go-icon>
+</span>
+
+<span style="display:contents;">
+  <go-icon name="cancel"></go-icon>
+</span>
+
+<span style="display:contents;">
+  <go-icon name="check_circle"></go-icon>
+</span>
+
+<span style="display:contents;">
+  <go-icon name="chrome_reader_mode"></go-icon>
+</span>
+
+<span style="display:contents;">
+  <go-icon name="close"></go-icon>
+</span>
+
+<span style="display:contents;">
+  <go-icon name="code"></go-icon>
+</span>
+
+<span style="display:contents;">
+  <go-icon name="content_copy"></go-icon>
+</span>
+
+<span style="display:contents;">
+  <go-icon name="filter_list"></go-icon>
+</span>
+
+<span style="display:contents;">
+  <go-icon name="folder"></go-icon>
+</span>
+
+<span style="display:contents;">
+  <go-icon name="help"></go-icon>
+</span>
+
+<span style="display:contents;">
+  <go-icon name="info"></go-icon>
+</span>
+
+<span style="display:contents;">
+  <go-icon name="insert_drive_file"></go-icon>
+</span>
+
+<span style="display:contents;">
+  <go-icon name="keyboard"></go-icon>
+</span>
+
+<span style="display:contents;">
+  <go-icon name="launch"></go-icon>
+</span>
+
+<span style="display:contents;">
+  <go-icon name="light_mode"></go-icon>
+</span>
+
+<span style="display:contents;">
+  <go-icon name="list"></go-icon>
+</span>
+
+<span style="display:contents;">
+  <go-icon name="menu"></go-icon>
+</span>
+
+<span style="display:contents;">
+  <go-icon name="more_vert"></go-icon>
+</span>
+
+<span style="display:contents;">
+  <go-icon name="navigate_before"></go-icon>
+</span>
+
+<span style="display:contents;">
+  <go-icon name="navigate_next"></go-icon>
+</span>
+
+<span style="display:contents;">
+  <go-icon name="responsive_layout"></go-icon>
+</span>
+
+<span style="display:contents;">
+  <go-icon name="search"></go-icon>
+</span>
+
+<span style="display:contents;">
+  <go-icon name="star"></go-icon>
+</span>
+
+<span style="display:contents;">
+  <go-icon name="table_rows"></go-icon>
+</span>
+
+<span style="display:contents;">
+  <go-icon name="toolbar"></go-icon>
+</span>
diff --git a/static/shared/icon/info_gm_grey_24dp.svg b/static/shared/icon/info_gm_grey_24dp.svg
new file mode 100644
index 0000000..ba73bf2
--- /dev/null
+++ b/static/shared/icon/info_gm_grey_24dp.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" height="24px" viewBox="0 0 24 24" width="24px" fill="#455A64"><path d="M0 0h24v24H0V0z" fill="none"/><path d="M11 7h2v2h-2zm0 4h2v6h-2zm1-9C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm0 18c-4.41 0-8-3.59-8-8s3.59-8 8-8 8 3.59 8 8-3.59 8-8 8z"/></svg>
\ No newline at end of file
diff --git a/static/shared/icon/insert_drive_file_gm_grey_24dp.svg b/static/shared/icon/insert_drive_file_gm_grey_24dp.svg
new file mode 100644
index 0000000..dd8ca81
--- /dev/null
+++ b/static/shared/icon/insert_drive_file_gm_grey_24dp.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" height="24px" viewBox="0 0 24 24" width="24px" fill="#455A64"><path d="M0 0h24v24H0V0z" fill="none"/><path d="M14 2H6c-1.1 0-1.99.9-1.99 2L4 20c0 1.1.89 2 1.99 2H18c1.1 0 2-.9 2-2V8l-6-6zM6 20V4h7v5h5v11H6z"/></svg>
\ No newline at end of file
diff --git a/static/shared/icon/keyboard_grey_24dp.svg b/static/shared/icon/keyboard_grey_24dp.svg
new file mode 100644
index 0000000..faea75d
--- /dev/null
+++ b/static/shared/icon/keyboard_grey_24dp.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" height="24px" viewBox="0 0 24 24" width="24px" fill="#455A64"><path d="M20 5H4c-1.1 0-1.99.9-1.99 2L2 17c0 1.1.9 2 2 2h16c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm-9 3h2v2h-2V8zm0 3h2v2h-2v-2zM8 8h2v2H8V8zm0 3h2v2H8v-2zm-1 2H5v-2h2v2zm0-3H5V8h2v2zm9 7H8v-2h8v2zm0-4h-2v-2h2v2zm0-3h-2V8h2v2zm3 3h-2v-2h2v2zm0-3h-2V8h2v2z"/><path d="M0 0h24v24H0zm0 0h24v24H0z" fill="none"/></svg>
\ No newline at end of file
diff --git a/static/shared/icon/launch_gm_grey_24dp.svg b/static/shared/icon/launch_gm_grey_24dp.svg
new file mode 100644
index 0000000..656d73e
--- /dev/null
+++ b/static/shared/icon/launch_gm_grey_24dp.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" height="24px" viewBox="0 0 24 24" width="24px" fill="#455A64"><path d="M0 0h24v24H0V0z" fill="none"/><path d="M19 19H5V5h7V3H5c-1.11 0-2 .9-2 2v14c0 1.1.89 2 2 2h14c1.1 0 2-.9 2-2v-7h-2v7zM14 3v2h3.59l-9.83 9.83 1.41 1.41L19 6.41V10h2V3h-7z"/></svg>
\ No newline at end of file
diff --git a/static/shared/icon/light_mode_gm_grey_24dp.svg b/static/shared/icon/light_mode_gm_grey_24dp.svg
new file mode 100644
index 0000000..e5cd8da
--- /dev/null
+++ b/static/shared/icon/light_mode_gm_grey_24dp.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" enable-background="new 0 0 24 24" height="24px" viewBox="0 0 24 24" width="24px" fill="#455A64"><rect fill="none" height="24" width="24"/><path d="M12,7c-2.76,0-5,2.24-5,5s2.24,5,5,5s5-2.24,5-5S14.76,7,12,7L12,7z M2,13l2,0c0.55,0,1-0.45,1-1s-0.45-1-1-1l-2,0 c-0.55,0-1,0.45-1,1S1.45,13,2,13z M20,13l2,0c0.55,0,1-0.45,1-1s-0.45-1-1-1l-2,0c-0.55,0-1,0.45-1,1S19.45,13,20,13z M11,2v2 c0,0.55,0.45,1,1,1s1-0.45,1-1V2c0-0.55-0.45-1-1-1S11,1.45,11,2z M11,20v2c0,0.55,0.45,1,1,1s1-0.45,1-1v-2c0-0.55-0.45-1-1-1 C11.45,19,11,19.45,11,20z M5.99,4.58c-0.39-0.39-1.03-0.39-1.41,0c-0.39,0.39-0.39,1.03,0,1.41l1.06,1.06 c0.39,0.39,1.03,0.39,1.41,0s0.39-1.03,0-1.41L5.99,4.58z M18.36,16.95c-0.39-0.39-1.03-0.39-1.41,0c-0.39,0.39-0.39,1.03,0,1.41 l1.06,1.06c0.39,0.39,1.03,0.39,1.41,0c0.39-0.39,0.39-1.03,0-1.41L18.36,16.95z M19.42,5.99c0.39-0.39,0.39-1.03,0-1.41 c-0.39-0.39-1.03-0.39-1.41,0l-1.06,1.06c-0.39,0.39-0.39,1.03,0,1.41s1.03,0.39,1.41,0L19.42,5.99z M7.05,18.36 c0.39-0.39,0.39-1.03,0-1.41c-0.39-0.39-1.03-0.39-1.41,0l-1.06,1.06c-0.39,0.39-0.39,1.03,0,1.41s1.03,0.39,1.41,0L7.05,18.36z"/></svg>
\ No newline at end of file
diff --git a/static/shared/icon/list_gm_grey_24dp.svg b/static/shared/icon/list_gm_grey_24dp.svg
new file mode 100644
index 0000000..2385eb0
--- /dev/null
+++ b/static/shared/icon/list_gm_grey_24dp.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" height="24px" viewBox="0 0 24 24" width="24px" fill="#455A64"><path d="M0 0h24v24H0V0z" fill="none" opacity=".87"/><path d="M0 0h24v24H0V0z" fill="none"/><path d="M4 13c.55 0 1-.45 1-1s-.45-1-1-1-1 .45-1 1 .45 1 1 1zm0 4c.55 0 1-.45 1-1s-.45-1-1-1-1 .45-1 1 .45 1 1 1zm0-8c.55 0 1-.45 1-1s-.45-1-1-1-1 .45-1 1 .45 1 1 1zm3 4h14v-2H7v2zm0 4h14v-2H7v2zM7 7v2h14V7H7z"/></svg>
\ No newline at end of file
diff --git a/static/shared/icon/menu_gm_grey_24dp.svg b/static/shared/icon/menu_gm_grey_24dp.svg
new file mode 100644
index 0000000..6b49702
--- /dev/null
+++ b/static/shared/icon/menu_gm_grey_24dp.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" height="24px" viewBox="0 0 24 24" width="24px" fill="#455A64"><path d="M0 0h24v24H0V0z" fill="none"/><path d="M3 18h18v-2H3v2zm0-5h18v-2H3v2zm0-7v2h18V6H3z"/></svg>
\ No newline at end of file
diff --git a/static/shared/icon/more_vert_gm_grey_24dp.svg b/static/shared/icon/more_vert_gm_grey_24dp.svg
new file mode 100644
index 0000000..0e809ca
--- /dev/null
+++ b/static/shared/icon/more_vert_gm_grey_24dp.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" height="24px" viewBox="0 0 24 24" width="24px" fill="#455A64"><path d="M0 0h24v24H0V0z" fill="none"/><path d="M12 8c1.1 0 2-.9 2-2s-.9-2-2-2-2 .9-2 2 .9 2 2 2zm0 2c-1.1 0-2 .9-2 2s.9 2 2 2 2-.9 2-2-.9-2-2-2zm0 6c-1.1 0-2 .9-2 2s.9 2 2 2 2-.9 2-2-.9-2-2-2z"/></svg>
\ No newline at end of file
diff --git a/static/shared/icon/navigate_before_gm_grey_24dp.svg b/static/shared/icon/navigate_before_gm_grey_24dp.svg
new file mode 100644
index 0000000..f790237
--- /dev/null
+++ b/static/shared/icon/navigate_before_gm_grey_24dp.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" height="24px" viewBox="0 0 24 24" width="24px" fill="#455A64"><path d="M0 0h24v24H0V0z" fill="none"/><path d="M15.41 7.41L14 6l-6 6 6 6 1.41-1.41L10.83 12l4.58-4.59z"/></svg>
\ No newline at end of file
diff --git a/static/shared/icon/navigate_next_gm_grey_24dp.svg b/static/shared/icon/navigate_next_gm_grey_24dp.svg
new file mode 100644
index 0000000..b44fd75
--- /dev/null
+++ b/static/shared/icon/navigate_next_gm_grey_24dp.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" height="24px" viewBox="0 0 24 24" width="24px" fill="#455A64"><path d="M0 0h24v24H0V0z" fill="none"/><path d="M10 6L8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6-6-6z"/></svg>
\ No newline at end of file
diff --git a/static/shared/icon/responsive_layout_gm_grey_24dp.svg b/static/shared/icon/responsive_layout_gm_grey_24dp.svg
new file mode 100644
index 0000000..b58b9ec
--- /dev/null
+++ b/static/shared/icon/responsive_layout_gm_grey_24dp.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" enable-background="new 0 0 24 24" height="24px" viewBox="0 0 24 24" width="24px" fill="#455A64"><rect fill="none" height="24" width="24"/><g><rect fill="none" height="24" width="24"/><g><g><path d="M8,2v6H2v14h20V2H8z M8,20H4V10h4V20z M20,20h-4V8h-6V4h10V20z"/></g></g></g></svg>
\ No newline at end of file
diff --git a/static/shared/icon/search_gm_grey_24dp.svg b/static/shared/icon/search_gm_grey_24dp.svg
new file mode 100644
index 0000000..aa154bf
--- /dev/null
+++ b/static/shared/icon/search_gm_grey_24dp.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" height="24px" viewBox="0 0 24 24" width="24px" fill="#455A64"><path d="M0 0h24v24H0V0z" fill="none"/><path d="M20.49 19l-5.73-5.73C15.53 12.2 16 10.91 16 9.5 16 5.91 13.09 3 9.5 3S3 5.91 3 9.5 5.91 16 9.5 16c1.41 0 2.7-.47 3.77-1.24L19 20.49 20.49 19zM5 9.5C5 7.01 7.01 5 9.5 5S14 7.01 14 9.5 11.99 14 9.5 14 5 11.99 5 9.5z"/></svg>
\ No newline at end of file
diff --git a/static/shared/icon/side_navigation_gm_grey_24dp.svg b/static/shared/icon/side_navigation_gm_grey_24dp.svg
new file mode 100644
index 0000000..39b7de1
--- /dev/null
+++ b/static/shared/icon/side_navigation_gm_grey_24dp.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" enable-background="new 0 0 24 24" height="24px" viewBox="0 0 24 24" width="24px" fill="#455A64"><g><rect fill="none" height="24" width="24"/><path d="M2,22h20V2H2V22z M20,20h-8V4h8V20z"/></g></svg>
\ No newline at end of file
diff --git a/static/shared/icon/star_gm_grey_24dp.svg b/static/shared/icon/star_gm_grey_24dp.svg
new file mode 100644
index 0000000..d0bde17
--- /dev/null
+++ b/static/shared/icon/star_gm_grey_24dp.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" height="24px" viewBox="0 0 24 24" width="24px" fill="#455A64"><path d="M0 0h24v24H0V0zm0 0h24v24H0V0z" fill="none"/><path d="M12 17.27L18.18 21l-1.64-7.03L22 9.24l-7.19-.61L12 2 9.19 8.63 2 9.24l5.46 4.73L5.82 21 12 17.27z"/></svg>
\ No newline at end of file
diff --git a/static/shared/icon/table_rows_gm_grey_24dp.svg b/static/shared/icon/table_rows_gm_grey_24dp.svg
new file mode 100644
index 0000000..22035ec
--- /dev/null
+++ b/static/shared/icon/table_rows_gm_grey_24dp.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" enable-background="new 0 0 24 24" height="24px" viewBox="0 0 24 24" width="24px" fill="#455A64"><rect fill="none" height="24" width="24"/><path d="M19,3H5C3.9,3,3,3.9,3,5v14c0,1.1,0.9,2,2,2h14c1.1,0,2-0.9,2-2V5C21,3.9,20.1,3,19,3z M19,5v3H5V5H19z M19,10v4H5v-4H19z M5,19v-3h14v3H5z"/></svg>
\ No newline at end of file
diff --git a/static/shared/icon/toolbar_gm_grey_24dp.svg b/static/shared/icon/toolbar_gm_grey_24dp.svg
new file mode 100644
index 0000000..bb2d026
--- /dev/null
+++ b/static/shared/icon/toolbar_gm_grey_24dp.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" height="24px" viewBox="0 0 24 24" width="24px" fill="#455A64"><path d="M0 0h24v24H0z" fill="none"/><path d="M2 2v20h20V2H2zm2 2h16v3H4V4zm0 16V9h16v11H4z"/></svg>
\ No newline at end of file
diff --git a/static/shared/icon/vertical_split_gm_grey_24dp.svg b/static/shared/icon/vertical_split_gm_grey_24dp.svg
new file mode 100644
index 0000000..1deb958
--- /dev/null
+++ b/static/shared/icon/vertical_split_gm_grey_24dp.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" height="24px" viewBox="0 0 24 24" width="24px" fill="#455A64"><path d="M0 0h24v24H0V0z" fill="none"/><path d="M3 13h8v2H3zm0 4h8v2H3zm0-8h8v2H3zm0-4h8v2H3zm18 0h-8v14h8V5z"/></svg>
\ No newline at end of file
diff --git a/static/shared/jump/jump.ts b/static/shared/jump/jump.ts
new file mode 100644
index 0000000..d671a56
--- /dev/null
+++ b/static/shared/jump/jump.ts
@@ -0,0 +1,298 @@
+/*!
+ * @license
+ * Copyright 2019-2020 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+// This file implements the behavior of the "jump to symbol" dialog for Go
+// package documentation, as well as the simple dialog that displays keyboard
+// shortcuts.
+
+// The DOM for the dialogs is at the bottom of static/frontend/unit/main/_modals.tmpl.
+// The CSS is in static/frontend/unit/main/_modals.css.
+
+// The dialog is activated by pressing the 'f' key. It presents a list
+// (#JumpDialog-list) of all Go symbols displayed in the documentation.
+// Entering text in the dialog's text box (#JumpDialog-filter) restricts the
+// list to symbols containing the text. Clicking on an symbol jumps to
+// its documentation.
+
+// This code is based on
+// https://go.googlesource.com/gddo/+/refs/heads/master/gddo-server/assets/site.js.
+// It was modified to remove the dependence on jquery and bootstrap.
+
+import { keyboard } from '../keyboard/keyboard';
+
+export function initModals(): void {
+  const jumpDialog = document.querySelector<HTMLDialogElement>('.JumpDialog');
+  const jumpBody = jumpDialog?.querySelector<HTMLDivElement>('.JumpDialog-body');
+  const jumpList = jumpDialog?.querySelector<HTMLDivElement>('.JumpDialog-list');
+  const jumpFilter = jumpDialog?.querySelector<HTMLInputElement>('.JumpDialog-input');
+  const doc = document.querySelector<HTMLDivElement>('.js-documentation');
+
+  interface JumpListItem {
+    link: HTMLAnchorElement;
+    name: string;
+    kind: string;
+    lower: string;
+  }
+
+  let jumpListItems: JumpListItem[] | undefined; // All the symbols in the doc; computed only once.
+
+  // collectJumpListItems returns a list of items, one for each symbol in the
+  // documentation on the current page.
+  //
+  // It uses the data-kind attribute generated in the documentation HTML to find
+  // the symbols and their id attributes.
+  //
+  // If there are no data-kind attributes, then we have older doc; fall back to
+  // a less precise method.
+  function collectJumpListItems() {
+    const items = [];
+    if (!doc) return;
+    for (const el of doc.querySelectorAll('[data-kind]')) {
+      items.push(newJumpListItem(el));
+    }
+
+    // Clicking on any of the links closes the dialog.
+    for (const item of items) {
+      item.link.addEventListener('click', function () {
+        jumpDialog?.close();
+      });
+    }
+    // Sort case-insensitively by symbol name.
+    items.sort(function (a, b) {
+      return a.lower.localeCompare(b.lower);
+    });
+    return items;
+  }
+
+  // newJumpListItem creates a new item for the DOM element el.
+  // An item is an object with:
+  // - name: the element's id (which is the symbol name)
+  // - kind: the element's kind (function, variable, etc.),
+  // - link: a link ('a' tag) to the element
+  // - lower: the name in lower case, just for sorting
+  function newJumpListItem(el: Element): JumpListItem {
+    const a = document.createElement('a');
+    const name = el.getAttribute('id');
+    a.setAttribute('href', '#' + name);
+    a.setAttribute('tabindex', '-1');
+    a.setAttribute('data-gtmc', 'jump to link');
+    const kind = el.getAttribute('data-kind');
+    return {
+      link: a,
+      name: name ?? '',
+      kind: kind ?? '',
+      lower: name?.toLowerCase() ?? '', // for sorting
+    };
+  }
+
+  let lastFilterValue: string; // The last contents of the filter text box.
+  let activeJumpItem = -1; // The index of the currently active item in the list.
+
+  // updateJumpList sets the elements of the dialog list to
+  // everything whose name contains filter.
+  function updateJumpList(filter: string) {
+    lastFilterValue = filter;
+    if (!jumpListItems) {
+      jumpListItems = collectJumpListItems();
+    }
+    setActiveJumpItem(-1);
+
+    // Remove all children from list.
+    while (jumpList?.firstChild) {
+      jumpList.firstChild.remove();
+    }
+
+    if (filter) {
+      // A filter is set. We treat the filter as a substring that can appear in
+      // an item name (case insensitive), and find the following matches - in
+      // order of priority:
+      //
+      // 1. Exact matches (the filter matches the item's name exactly)
+      // 2. Prefix matches (the item's name starts with filter)
+      // 3. Infix matches (the filter is a substring of the item's name)
+      const filterLowerCase = filter.toLowerCase();
+
+      const exactMatches = [];
+      const prefixMatches = [];
+      const infixMatches = [];
+
+      // makeLinkHtml creates the link name HTML for a list item. item is the DOM
+      // item. item.name.substr(boldStart, boldEnd) will be bolded.
+      const makeLinkHtml = (item: JumpListItem, boldStart: number, boldEnd: number) => {
+        return (
+          item.name.substring(0, boldStart) +
+          '<b>' +
+          item.name.substring(boldStart, boldEnd) +
+          '</b>' +
+          item.name.substring(boldEnd)
+        );
+      };
+
+      for (const item of jumpListItems ?? []) {
+        const nameLowerCase = item.name.toLowerCase();
+
+        if (nameLowerCase === filterLowerCase) {
+          item.link.innerHTML = makeLinkHtml(item, 0, item.name.length);
+          exactMatches.push(item);
+        } else if (nameLowerCase.startsWith(filterLowerCase)) {
+          item.link.innerHTML = makeLinkHtml(item, 0, filter.length);
+          prefixMatches.push(item);
+        } else {
+          const index = nameLowerCase.indexOf(filterLowerCase);
+          if (index > -1) {
+            item.link.innerHTML = makeLinkHtml(item, index, index + filter.length);
+            infixMatches.push(item);
+          }
+        }
+      }
+
+      for (const item of exactMatches.concat(prefixMatches).concat(infixMatches)) {
+        jumpList?.appendChild(item.link);
+      }
+    } else {
+      if (!jumpListItems || jumpListItems.length === 0) {
+        const msg = document.createElement('i');
+        msg.innerHTML = 'There are no symbols on this page.';
+        jumpList?.appendChild(msg);
+      }
+      // No filter set; display all items in their existing order.
+      for (const item of jumpListItems ?? []) {
+        item.link.innerHTML = item.name + ' <i>' + item.kind + '</i>';
+        jumpList?.appendChild(item.link);
+      }
+    }
+
+    if (jumpBody) {
+      jumpBody.scrollTop = 0;
+    }
+    if (jumpListItems?.length && jumpList && jumpList.children.length > 0) {
+      setActiveJumpItem(0);
+    }
+  }
+
+  // Set the active jump item to n.
+  function setActiveJumpItem(n: number) {
+    const cs = jumpList?.children as HTMLCollectionOf<HTMLElement> | null | undefined;
+    if (!cs || !jumpBody) {
+      return;
+    }
+    if (activeJumpItem >= 0) {
+      cs[activeJumpItem].classList.remove('JumpDialog-active');
+    }
+    if (n >= cs.length) {
+      n = cs.length - 1;
+    }
+    if (n >= 0) {
+      cs[n].classList.add('JumpDialog-active');
+
+      // Scroll so the active item is visible.
+      // For some reason cs[n].scrollIntoView() doesn't behave as I'd expect:
+      // it moves the entire dialog box in the viewport.
+
+      // Get the top and bottom of the active item relative to jumpBody.
+      const activeTop = cs[n].offsetTop - cs[0].offsetTop;
+      const activeBottom = activeTop + cs[n].clientHeight;
+      if (activeTop < jumpBody.scrollTop) {
+        // Off the top; scroll up.
+        jumpBody.scrollTop = activeTop;
+      } else if (activeBottom > jumpBody.scrollTop + jumpBody.clientHeight) {
+        // Off the bottom; scroll down.
+        jumpBody.scrollTop = activeBottom - jumpBody.clientHeight;
+      }
+    }
+    activeJumpItem = n;
+  }
+
+  // Increment the activeJumpItem by delta.
+  function incActiveJumpItem(delta: number) {
+    if (activeJumpItem < 0) {
+      return;
+    }
+    let n = activeJumpItem + delta;
+    if (n < 0) {
+      n = 0;
+    }
+    setActiveJumpItem(n);
+  }
+
+  // Pressing a key in the filter updates the list (if the filter actually changed).
+  jumpFilter?.addEventListener('keyup', function () {
+    if (jumpFilter.value.toUpperCase() != lastFilterValue.toUpperCase()) {
+      updateJumpList(jumpFilter.value);
+    }
+  });
+
+  // Pressing enter in the filter selects the first element in the list.
+  jumpFilter?.addEventListener('keydown', function (event) {
+    const upArrow = 38;
+    const downArrow = 40;
+    const enterKey = 13;
+    switch (event.which) {
+      case upArrow:
+        incActiveJumpItem(-1);
+        event.preventDefault();
+        break;
+      case downArrow:
+        incActiveJumpItem(1);
+        event.preventDefault();
+        break;
+      case enterKey:
+        if (activeJumpItem >= 0) {
+          if (jumpList) {
+            (jumpList.children[activeJumpItem] as HTMLElement).click();
+            event.preventDefault();
+          }
+        }
+        break;
+    }
+  });
+
+  const shortcutsDialog = document.querySelector<HTMLDialogElement>('.ShortcutsDialog');
+
+  // - Pressing 'f' or 'F' opens the jump-to-symbol dialog.
+  // - Pressing '?' opens up the shortcut dialog.
+  // Ignore a keypress if a dialog is already open, or if it is pressed on a
+  // component that wants to consume it.
+  keyboard
+    .on('f', 'open jump to modal', e => {
+      if (jumpDialog?.open || shortcutsDialog?.open) {
+        return;
+      }
+      e.preventDefault();
+      if (jumpFilter) {
+        jumpFilter.value = '';
+      }
+      jumpDialog?.showModal?.();
+      jumpFilter?.focus();
+      updateJumpList('');
+    })
+    .on('?', 'open shortcuts modal', () => {
+      if (jumpDialog?.open || shortcutsDialog?.open) {
+        return;
+      }
+      shortcutsDialog?.showModal?.();
+    });
+
+  const jumpOutlineInput = document.querySelector('.js-jumpToInput');
+  if (jumpOutlineInput) {
+    jumpOutlineInput.addEventListener('click', () => {
+      if (jumpFilter) {
+        jumpFilter.value = '';
+      }
+      updateJumpList('');
+      if (jumpDialog?.open || shortcutsDialog?.open) {
+        return;
+      }
+      jumpDialog?.showModal?.();
+      jumpFilter?.focus();
+    });
+  }
+
+  document.querySelector('.js-openShortcuts')?.addEventListener('click', () => {
+    shortcutsDialog?.showModal?.();
+  });
+}
diff --git a/static/shared/logo/go-blue-gradient.svg b/static/shared/logo/go-blue-gradient.svg
new file mode 100644
index 0000000..baaae77
--- /dev/null
+++ b/static/shared/logo/go-blue-gradient.svg
@@ -0,0 +1 @@
+<svg height="77" viewBox="0 0 206 77" width="206" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><linearGradient id="a" x1="100%" x2="0%" y1="50%" y2="50%"><stop offset="0" stop-color="#00a29c"/><stop offset="1" stop-color="#00add8"/></linearGradient><path d="m127.481483 31.4343267c1.445351-4.5790807 3.790459-8.9059246 6.918517-13 7.3-9.59999996 16.1-14.59999996 28-16.69999996 10.2-1.8 19.8-.8 28.5 5.1 7.9 5.39999996 12.8 12.69999996 14.1 22.29999996 1.7 13.5-2.2 24.5-11.5 33.9-6.6 6.7-14.7 10.9-24 12.8-2.7.5-5.4.6-8 .9-9.1-.2-17.4-2.8-24.4-8.8-4.923224-4.2556681-8.314592-9.4861534-9.999798-15.5752516-1.1695 2.3617137-2.567865 4.6235348-4.200202 6.7752516-7.2 9.5-16.6 15.4-28.5 17-9.8 1.3-18.9-.6-26.9-6.6-7.4-5.6-11.6-13-12.7-22.2-1.3-10.9 1.9-20.7 8.5-29.3 7.1-9.29999996 16.5-15.19999996 28-17.29999996 9.4-1.70000001 18.4-.6 26.5 4.9 5.3 3.5 9.1 8.29999996 11.6 14.09999996.6.9.2 1.4-1 1.7-6.3 1.6-10.6 2.8-16.8 4.4-1.5.4-1.6.5-2.9-1-1.5-1.7-2.6-2.8-4.7-3.8-6.3-3.1-12.4-2.2-18.1 1.5-6.8 4.4-10.3 10.9-10.2 19 .1 8 5.6 14.6 13.5 15.7 6.8.9 12.5-1.5 17-6.6.9-1.1 1.7-2.3 2.7-3.7-3.6 0-8.1 0-19.3 0-2.1 0-2.6-1.3-1.9-3 1.3-3.1 3.7-8.3 5.1-10.9.3-.6 1-1.6 2.5-1.6zm-111.981483-8.2c-.4 0-.5-.2-.3-.5l2.1-2.7c.2-.3.7-.5 1.1-.5h35.7c.4 0 .5.3.3.6l-1.7 2.6c-.2.3-.7.6-1 .6zm-15.1 9.2c-.4 0-.5-.2-.3-.5l2.1-2.7c.2-.3.7-.5 1.1-.5h45.6c.4 0 .6.3.5.6l-.8 2.4c-.1.4-.5.6-.9.6zm24.2 9.2c-.4 0-.5-.3-.3-.6l1.4-2.5c.2-.3.6-.6 1-.6h20c.4 0 .6.3.6.7l-.2 2.4c0 .4-.4.7-.7.7zm160.7-5.3c-.1-1.3-.1-2.3-.3-3.3-1.8-9.9-10.9-15.5-20.4-13.3-9.3 2.1-15.3 8-17.5 17.4-1.8 7.8 2 15.7 9.2 18.9 5.5 2.4 11 2.1 16.3-.6 7.9-4.1 12.2-10.5 12.7-19.1z" fill="url(#a)"/></svg>
diff --git a/static/shared/logo/go-blue.svg b/static/shared/logo/go-blue.svg
new file mode 100644
index 0000000..da6ea83
--- /dev/null
+++ b/static/shared/logo/go-blue.svg
@@ -0,0 +1 @@
+<svg height="78" viewBox="0 0 207 78" width="207" xmlns="http://www.w3.org/2000/svg"><g fill="#00acd7" fill-rule="evenodd"><path d="m16.2 24.1c-.4 0-.5-.2-.3-.5l2.1-2.7c.2-.3.7-.5 1.1-.5h35.7c.4 0 .5.3.3.6l-1.7 2.6c-.2.3-.7.6-1 .6z"/><path d="m1.1 33.3c-.4 0-.5-.2-.3-.5l2.1-2.7c.2-.3.7-.5 1.1-.5h45.6c.4 0 .6.3.5.6l-.8 2.4c-.1.4-.5.6-.9.6z"/><path d="m25.3 42.5c-.4 0-.5-.3-.3-.6l1.4-2.5c.2-.3.6-.6 1-.6h20c.4 0 .6.3.6.7l-.2 2.4c0 .4-.4.7-.7.7z"/><g transform="translate(55)"><path d="m74.1 22.3c-6.3 1.6-10.6 2.8-16.8 4.4-1.5.4-1.6.5-2.9-1-1.5-1.7-2.6-2.8-4.7-3.8-6.3-3.1-12.4-2.2-18.1 1.5-6.8 4.4-10.3 10.9-10.2 19 .1 8 5.6 14.6 13.5 15.7 6.8.9 12.5-1.5 17-6.6.9-1.1 1.7-2.3 2.7-3.7-3.6 0-8.1 0-19.3 0-2.1 0-2.6-1.3-1.9-3 1.3-3.1 3.7-8.3 5.1-10.9.3-.6 1-1.6 2.5-1.6h36.4c-.2 2.7-.2 5.4-.6 8.1-1.1 7.2-3.8 13.8-8.2 19.6-7.2 9.5-16.6 15.4-28.5 17-9.8 1.3-18.9-.6-26.9-6.6-7.4-5.6-11.6-13-12.7-22.2-1.3-10.9 1.9-20.7 8.5-29.3 7.1-9.3 16.5-15.2 28-17.3 9.4-1.7 18.4-.6 26.5 4.9 5.3 3.5 9.1 8.3 11.6 14.1.6.9.2 1.4-1 1.7z"/><path d="m107.2 77.6c-9.1-.2-17.4-2.8-24.4-8.8-5.9-5.1-9.6-11.6-10.8-19.3-1.8-11.3 1.3-21.3 8.1-30.2 7.3-9.6 16.1-14.6 28-16.7 10.2-1.8 19.8-.8 28.5 5.1 7.9 5.4 12.8 12.7 14.1 22.3 1.7 13.5-2.2 24.5-11.5 33.9-6.6 6.7-14.7 10.9-24 12.8-2.7.5-5.4.6-8 .9zm23.8-40.4c-.1-1.3-.1-2.3-.3-3.3-1.8-9.9-10.9-15.5-20.4-13.3-9.3 2.1-15.3 8-17.5 17.4-1.8 7.8 2 15.7 9.2 18.9 5.5 2.4 11 2.1 16.3-.6 7.9-4.1 12.2-10.5 12.7-19.1z" fill-rule="nonzero"/></g></g></svg>
\ No newline at end of file
diff --git a/static/shared/logo/go-white.svg b/static/shared/logo/go-white.svg
new file mode 100644
index 0000000..727a62e
--- /dev/null
+++ b/static/shared/logo/go-white.svg
@@ -0,0 +1 @@
+<svg height="78" viewBox="0 0 207 78" width="207" xmlns="http://www.w3.org/2000/svg"><g fill="#ffffff" fill-rule="evenodd"><path d="m16.2 24.1c-.4 0-.5-.2-.3-.5l2.1-2.7c.2-.3.7-.5 1.1-.5h35.7c.4 0 .5.3.3.6l-1.7 2.6c-.2.3-.7.6-1 .6z"/><path d="m1.1 33.3c-.4 0-.5-.2-.3-.5l2.1-2.7c.2-.3.7-.5 1.1-.5h45.6c.4 0 .6.3.5.6l-.8 2.4c-.1.4-.5.6-.9.6z"/><path d="m25.3 42.5c-.4 0-.5-.3-.3-.6l1.4-2.5c.2-.3.6-.6 1-.6h20c.4 0 .6.3.6.7l-.2 2.4c0 .4-.4.7-.7.7z"/><g transform="translate(55)"><path d="m74.1 22.3c-6.3 1.6-10.6 2.8-16.8 4.4-1.5.4-1.6.5-2.9-1-1.5-1.7-2.6-2.8-4.7-3.8-6.3-3.1-12.4-2.2-18.1 1.5-6.8 4.4-10.3 10.9-10.2 19 .1 8 5.6 14.6 13.5 15.7 6.8.9 12.5-1.5 17-6.6.9-1.1 1.7-2.3 2.7-3.7-3.6 0-8.1 0-19.3 0-2.1 0-2.6-1.3-1.9-3 1.3-3.1 3.7-8.3 5.1-10.9.3-.6 1-1.6 2.5-1.6h36.4c-.2 2.7-.2 5.4-.6 8.1-1.1 7.2-3.8 13.8-8.2 19.6-7.2 9.5-16.6 15.4-28.5 17-9.8 1.3-18.9-.6-26.9-6.6-7.4-5.6-11.6-13-12.7-22.2-1.3-10.9 1.9-20.7 8.5-29.3 7.1-9.3 16.5-15.2 28-17.3 9.4-1.7 18.4-.6 26.5 4.9 5.3 3.5 9.1 8.3 11.6 14.1.6.9.2 1.4-1 1.7z"/><path d="m107.2 77.6c-9.1-.2-17.4-2.8-24.4-8.8-5.9-5.1-9.6-11.6-10.8-19.3-1.8-11.3 1.3-21.3 8.1-30.2 7.3-9.6 16.1-14.6 28-16.7 10.2-1.8 19.8-.8 28.5 5.1 7.9 5.4 12.8 12.7 14.1 22.3 1.7 13.5-2.2 24.5-11.5 33.9-6.6 6.7-14.7 10.9-24 12.8-2.7.5-5.4.6-8 .9zm23.8-40.4c-.1-1.3-.1-2.3-.3-3.3-1.8-9.9-10.9-15.5-20.4-13.3-9.3 2.1-15.3 8-17.5 17.4-1.8 7.8 2 15.7 9.2 18.9 5.5 2.4 11 2.1 16.3-.6 7.9-4.1 12.2-10.5 12.7-19.1z" fill-rule="nonzero"/></g></g></svg>
\ No newline at end of file
diff --git a/static/shared/logo/google-white.svg b/static/shared/logo/google-white.svg
new file mode 100644
index 0000000..d017d2a
--- /dev/null
+++ b/static/shared/logo/google-white.svg
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/static/shared/message/message.css b/static/shared/message/message.css
new file mode 100644
index 0000000..b2ed112
--- /dev/null
+++ b/static/shared/message/message.css
@@ -0,0 +1,27 @@
+/*!
+ * Copyright 2021 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+.go-Message {
+  color: var(--color-text);
+  font-size: 0.875rem;
+  line-height: 1.5rem;
+  padding: 0.25rem 0.5rem;
+  width: 100%;
+}
+.go-Message--notice {
+  background-color: var(--color-background-info);
+}
+.go-Message--warning {
+  background-color: var(--color-background-warning);
+  color: var(--gray-1);
+}
+.go-Message--alert {
+  background-color: var(--color-background-alert);
+}
+
+.go-Message > .go-Icon {
+  vertical-align: text-top;
+}
diff --git a/static/shared/message/message.md b/static/shared/message/message.md
new file mode 100644
index 0000000..1a53a97
--- /dev/null
+++ b/static/shared/message/message.md
@@ -0,0 +1,46 @@
+## Messages
+
+---
+
+### Notice {#message-notice}
+
+```html
+<div class="go-Message go-Message--notice">
+  <img
+    class="go-Icon"
+    height="24"
+    width="24"
+    src="/static/shared/icon/info_gm_grey_24dp.svg"
+    alt="Notice"
+  />&nbsp; The highest tagged major version is v3.
+</div>
+```
+
+### Warning {#message-warning}
+
+```html
+<div class="go-Message go-Message--warning">
+  <img
+    class="go-Icon"
+    height="24"
+    width="24"
+    src="/static/shared/icon/alert_gm_grey_24dp.svg"
+    alt="Warning"
+  />&nbsp; <strong>Retracted:</strong> This version of Syntax has been retracted.
+</div>
+```
+
+### Alert {#message-alert}
+
+```html
+<div class="go-Message go-Message--alert">
+  <img
+    class="go-Icon"
+    height="24"
+    width="24"
+    src="/static/shared/icon/alert_gm_grey_24dp.svg"
+    alt="Alert"
+  />&nbsp;
+  <strong>Critical error</strong>
+</div>
+```
diff --git a/static/shared/modal/modal.css b/static/shared/modal/modal.css
new file mode 100644
index 0000000..eec7b20
--- /dev/null
+++ b/static/shared/modal/modal.css
@@ -0,0 +1,60 @@
+/*!
+ * Copyright 2021 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+@import url('../../../third_party/dialog-polyfill/dialog-polyfill.css');
+
+.go-Modal {
+  background: var(--color-background);
+  border: var(--border);
+  border-radius: var(--border-radius);
+  bottom: 0;
+  box-shadow: var(--box-shadow);
+  color: var(--color-text);
+  display: flex;
+  flex-direction: column;
+  gap: 1rem;
+  max-height: 100%;
+  max-width: 100%;
+  position: fixed;
+  top: 0;
+}
+.go-Modal > form {
+  display: contents;
+}
+.go-Modal--small {
+  width: 20rem;
+}
+.go-Modal--md {
+  width: 30rem;
+}
+.go-Modal--lg {
+  width: 40rem;
+}
+.go-Modal-header {
+  display: flex;
+  justify-content: space-between;
+}
+.go-Modal-header h2 {
+  font-size: 1.15rem;
+  line-height: 1.25rem;
+}
+.go-Modal-body {
+  flex-grow: 1;
+  min-height: 2rem;
+  min-width: 18rem;
+}
+.go-Modal-actions {
+  text-align: right;
+}
+
+/* Safari only */
+@media not all and (min-resolution: 0.001dpcm) {
+  @supports (-webkit-appearance: none) {
+    .go-Modal {
+      padding-bottom: 0;
+    }
+  }
+}
diff --git a/static/shared/modal/modal.md b/static/shared/modal/modal.md
new file mode 100644
index 0000000..cd1f8d4
--- /dev/null
+++ b/static/shared/modal/modal.md
@@ -0,0 +1,107 @@
+## Modals
+
+---
+
+The size modifer class is optional. The base modal will grow to fit the inner content.
+
+### Small {#modal-small}
+
+```html
+<dialog id="example-modal-id1" class="go-Modal go-Modal--sm js-modal">
+  <form method="dialog">
+    <div class="go-Modal-header">
+      <h2>Small Modal</h2>
+      <button
+        class="go-Button go-Button--inline"
+        type="button"
+        data-modal-close
+        data-gtmc="modal button"
+        aria-label="Close"
+      >
+        <img
+          class="go-Icon"
+          height="24"
+          width="24"
+          src="/static/shared/icon/close_gm_grey_24dp.svg"
+          alt=""
+        />
+      </button>
+    </div>
+    <div class="go-Modal-body">
+      <p>Hello, world!</p>
+    </div>
+    <div class="go-Modal-actions">
+      <button class="go-Button" data-modal-close data-gtmc="modal button">Submit</button>
+    </div>
+  </form>
+</dialog>
+<button class="go-Button" aria-controls="example-modal-id1" data-gtmc="modal button">Open</button>
+```
+
+### Medium {#modal-medium}
+
+```html
+<dialog id="example-modal-id2" class="go-Modal go-Modal--md js-modal">
+  <form method="dialog">
+    <div class="go-Modal-header">
+      <h2>Medium Modal</h2>
+      <button
+        class="go-Button go-Button--inline"
+        type="button"
+        data-modal-close
+        data-gtmc="modal button"
+        aria-label="Close"
+      >
+        <img
+          class="go-Icon"
+          height="24"
+          width="24"
+          src="/static/shared/icon/close_gm_grey_24dp.svg"
+          alt=""
+        />
+      </button>
+    </div>
+    <div class="go-Modal-body">
+      <p>Hello, world!</p>
+    </div>
+    <div class="go-Modal-actions">
+      <button class="go-Button" data-modal-close data-gtmc="modal button">Submit</button>
+    </div>
+  </form>
+</dialog>
+<button class="go-Button" aria-controls="example-modal-id2">Open</button>
+```
+
+### Large {#modal-large}
+
+```html
+<dialog id="example-modal-id3" class="go-Modal go-Modal--lg js-modal">
+  <form method="dialog">
+    <div class="go-Modal-header">
+      <h2>Large Modal</h2>
+      <button
+        class="go-Button go-Button--inline"
+        type="button"
+        data-modal-close
+        data-gtmc="modal button"
+        aria-label="Close"
+      >
+        <img
+          class="go-Icon"
+          height="24"
+          width="24"
+          src="/static/shared/icon/close_gm_grey_24dp.svg"
+          alt=""
+        />
+      </button>
+    </div>
+    <div class="go-Modal-body">
+      <p>Hello, world!</p>
+    </div>
+    <div class="go-Modal-actions">
+      <button class="go-Button" data-modal-close data-gtmc="modal button">Submit</button>
+    </div>
+  </form>
+</dialog>
+<button class="go-Button" aria-controls="example-modal-id3" data-gtmc="modal button">Open</button>
+```
diff --git a/static/shared/modal/modal.test.ts b/static/shared/modal/modal.test.ts
new file mode 100644
index 0000000..841d79c
--- /dev/null
+++ b/static/shared/modal/modal.test.ts
@@ -0,0 +1,37 @@
+/**
+ * @license
+ * Copyright 2021 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+import { parse } from '../../markdown';
+import { ModalController } from './modal';
+
+describe('Modal', () => {
+  let modal: HTMLDialogElement;
+  let openButton: HTMLButtonElement;
+  let closeButton: HTMLButtonElement;
+
+  beforeEach(async () => {
+    document.body.innerHTML = await parse(__dirname + '/modal.md');
+    modal = document.querySelector('#example-modal-id1');
+    openButton = document.querySelector('[aria-controls="example-modal-id1"]');
+    new ModalController(modal);
+    openButton.click();
+    closeButton = document.querySelector('[data-modal-close]');
+  });
+
+  afterEach(() => {
+    document.body.innerHTML = '';
+  });
+
+  it('opens', () => {
+    expect(modal.getAttribute('opened')).toBeTruthy();
+  });
+
+  it('closes on cancel', async () => {
+    closeButton.click();
+    expect(modal.getAttribute('opened')).toBeFalsy();
+  });
+});
diff --git a/static/shared/modal/modal.ts b/static/shared/modal/modal.ts
new file mode 100644
index 0000000..91d8feb
--- /dev/null
+++ b/static/shared/modal/modal.ts
@@ -0,0 +1,51 @@
+/**
+ * @license
+ * Copyright 2021 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+interface Window {
+  dialogPolyfill?: {
+    registerDialog: (el: HTMLDialogElement) => void;
+  };
+}
+
+declare const window: Window;
+
+/**
+ * ModalController registers a dialog element with the polyfill if
+ * necessary for the current browser, add adds event listeners to
+ * close and open modals.
+ */
+export class ModalController {
+  constructor(private el: HTMLDialogElement) {
+    if (window.dialogPolyfill) {
+      window.dialogPolyfill.registerDialog(el);
+    }
+    this.init();
+  }
+
+  init() {
+    const button = document.querySelector<HTMLButtonElement>(`[aria-controls="${this.el.id}"]`);
+    if (button) {
+      button.addEventListener('click', () => {
+        if (this.el.showModal) {
+          this.el.showModal();
+        } else {
+          this.el.setAttribute('opened', 'true');
+        }
+        this.el.querySelector('input')?.focus();
+      });
+    }
+    for (const btn of this.el.querySelectorAll<HTMLButtonElement>('[data-modal-close]')) {
+      btn.addEventListener('click', () => {
+        if (this.el.close) {
+          this.el.close();
+        } else {
+          this.el.removeAttribute('opened');
+        }
+      });
+    }
+  }
+}
diff --git a/static/shared/outline/__snapshots__/select.test.ts.snap b/static/shared/outline/__snapshots__/select.test.ts.snap
new file mode 100644
index 0000000..d4f74e3
--- /dev/null
+++ b/static/shared/outline/__snapshots__/select.test.ts.snap
@@ -0,0 +1,97 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`creates select nav from tree 1`] = `
+<label
+  aria-label="Menu"
+  class="go-Label"
+>
+  <select
+    class="go-Select js-selectNav"
+  >
+    <optgroup
+      label="Outline"
+    >
+      <option
+        label="Level 1"
+        value="#one"
+      >
+        Level 1
+      </option>
+    </optgroup>
+    <optgroup
+      label="Level 1"
+    >
+      <option
+        label="Level 2-1"
+        value="#two-one"
+      >
+        Level 2-1
+      </option>
+      <option
+        label="Level 2-2"
+        value="#two-two"
+      >
+        Level 2-2
+      </option>
+      <option
+        label="Level 2-3"
+        value="#two-three"
+      >
+        Level 2-3
+      </option>
+    </optgroup>
+    <optgroup
+      label="Level 2-2"
+    >
+      <option
+        label="Level 3-1"
+        value="#three-one"
+      >
+        Level 3-1
+      </option>
+    </optgroup>
+    <optgroup
+      label="Level 3-1"
+    >
+      <option
+        label="Level 4-1"
+        value="#four-one"
+      >
+        Level 4-1
+      </option>
+      <option
+        label="Level 4-2"
+        value="#four-two"
+      >
+        Level 4-2
+      </option>
+    </optgroup>
+    <optgroup
+      label="Level 2-3"
+    >
+      <option
+        label="Level 3-2"
+        value="#three-two"
+      >
+        Level 3-2
+      </option>
+    </optgroup>
+    <optgroup
+      label="Level 3-2"
+    >
+      <option
+        label="Level 4-3"
+        value="#four-three"
+      >
+        Level 4-3
+      </option>
+      <option
+        label="Level 4-4"
+        value="#four-four"
+      >
+        Level 4-4
+      </option>
+    </optgroup>
+  </select>
+</label>
+`;
diff --git a/static/shared/outline/__snapshots__/tree.test.ts.snap b/static/shared/outline/__snapshots__/tree.test.ts.snap
new file mode 100644
index 0000000..1732086
--- /dev/null
+++ b/static/shared/outline/__snapshots__/tree.test.ts.snap
@@ -0,0 +1,248 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`creates tree nav from ul 1`] = `
+<ul
+  class="go-Tree js-tree"
+  role="tree"
+  style="--js-tree-height: 0px;"
+>
+  
+  
+  <li
+    role="none"
+  >
+    
+    
+    <a
+      aria-expanded="false"
+      aria-level="1"
+      aria-owns="_nav_group_Level_1"
+      class="focus"
+      href="#one"
+      role="treeitem"
+      tabindex="0"
+    >
+      Level 1
+    </a>
+    
+    
+    <ul
+      id="_nav_group_Level_1"
+      role="group"
+    >
+      
+      
+      <li
+        role="none"
+      >
+        
+        
+        <a
+          aria-level="2"
+          href="#two-one"
+          role="treeitem"
+          tabindex="-1"
+        >
+          Level 2-1
+        </a>
+        
+      
+      </li>
+      
+      
+      <li
+        role="none"
+      >
+        
+        
+        <a
+          aria-expanded="false"
+          aria-level="2"
+          aria-owns="Level_1_nav_group_Level_2_2"
+          href="#two-two"
+          role="treeitem"
+          tabindex="-1"
+        >
+          Level 2-2
+        </a>
+        
+        
+        <ul
+          id="Level_1_nav_group_Level_2_2"
+          role="group"
+        >
+          
+          
+          <li
+            role="none"
+          >
+            
+            
+            <a
+              aria-expanded="false"
+              aria-level="3"
+              aria-owns="Level_2_2_nav_group_Level_3_1"
+              href="#three-one"
+              role="treeitem"
+              tabindex="-1"
+            >
+              Level 3-1
+            </a>
+            
+            
+            <ul
+              id="Level_2_2_nav_group_Level_3_1"
+              role="group"
+            >
+              
+              
+              <li
+                role="none"
+              >
+                
+                
+                <a
+                  aria-level="4"
+                  href="#four-one"
+                  role="treeitem"
+                  tabindex="-1"
+                >
+                  Level 4-1
+                </a>
+                
+              
+              </li>
+              
+              
+              <li
+                role="none"
+              >
+                
+                
+                <a
+                  aria-level="4"
+                  href="#four-two"
+                  role="treeitem"
+                  tabindex="-1"
+                >
+                  Level 4-2
+                </a>
+                
+              
+              </li>
+              
+            
+            </ul>
+            
+          
+          </li>
+          
+        
+        </ul>
+        
+      
+      </li>
+      
+      
+      <li
+        role="none"
+      >
+        
+        
+        <a
+          aria-expanded="false"
+          aria-level="2"
+          aria-owns="Level_1_nav_group_Level_2_3"
+          href="#two-three"
+          role="treeitem"
+          tabindex="-1"
+        >
+          Level 2-3
+        </a>
+        
+        
+        <ul
+          id="Level_1_nav_group_Level_2_3"
+          role="group"
+        >
+          
+          
+          <li
+            role="none"
+          >
+            
+            
+            <a
+              aria-expanded="false"
+              aria-level="3"
+              aria-owns="Level_2_3_nav_group_Level_3_2"
+              href="#three-two"
+              role="treeitem"
+              tabindex="-1"
+            >
+              Level 3-2
+            </a>
+            
+            
+            <ul
+              id="Level_2_3_nav_group_Level_3_2"
+              role="group"
+            >
+              
+              
+              <li
+                role="none"
+              >
+                
+                
+                <a
+                  aria-level="4"
+                  href="#four-three"
+                  role="treeitem"
+                  tabindex="-1"
+                >
+                  Level 4-3
+                </a>
+                
+              
+              </li>
+              
+              
+              <li
+                role="none"
+              >
+                
+                
+                <a
+                  aria-level="4"
+                  href="#four-four"
+                  role="treeitem"
+                  tabindex="-1"
+                >
+                  Level 4-4
+                </a>
+                
+              
+              </li>
+              
+            
+            </ul>
+            
+          
+          </li>
+          
+        
+        </ul>
+        
+      
+      </li>
+      
+    
+    </ul>
+    
+  
+  </li>
+  
+
+</ul>
+`;
diff --git a/static/shared/outline/outline.md b/static/shared/outline/outline.md
new file mode 100644
index 0000000..da253bd
--- /dev/null
+++ b/static/shared/outline/outline.md
@@ -0,0 +1,56 @@
+## Outline
+
+---
+
+### Tree {#outline-tree}
+
+```html
+<ul class="go-Tree js-tree" role="tree">
+  <li>
+    <a href="#one">Level 1</a>
+    <ul>
+      <li>
+        <a href="#two-one">Level 2-1</a>
+      </li>
+      <li>
+        <a href="#two-two">Level 2-2</a>
+        <ul>
+          <li>
+            <a href="#three-one">Level 3-1</a>
+            <ul>
+              <li>
+                <a href="#four-one">Level 4-1</a>
+              </li>
+              <li>
+                <a href="#four-two">Level 4-2</a>
+              </li>
+            </ul>
+          </li>
+        </ul>
+      </li>
+      <li>
+        <a href="#two-three">Level 2-3</a>
+        <ul>
+          <li>
+            <a href="#three-two">Level 3-2</a>
+            <ul>
+              <li>
+                <a href="#four-three">Level 4-3</a>
+              </li>
+              <li>
+                <a href="#four-four">Level 4-4</a>
+              </li>
+            </ul>
+          </li>
+        </ul>
+      </li>
+    </ul>
+  </li>
+</ul>
+```
+
+### Select {#outline-select}
+
+```html
+<div class="js-select"></div>
+```
diff --git a/static/shared/outline/select.test.ts b/static/shared/outline/select.test.ts
new file mode 100644
index 0000000..3b26880
--- /dev/null
+++ b/static/shared/outline/select.test.ts
@@ -0,0 +1,34 @@
+/**
+ * @license
+ * Copyright 2021 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+import { parse } from '../../markdown';
+import { TreeNavController } from './tree';
+import { makeSelectNav } from './select';
+
+const observe = jest.fn();
+window.IntersectionObserver = jest.fn(() => ({
+  observe,
+})) as any;
+
+let treeEl: HTMLElement;
+let tree: TreeNavController;
+let selectNav: HTMLElement;
+
+beforeEach(async () => {
+  document.body.innerHTML = await parse(__dirname + '/outline.md');
+  treeEl = document.querySelector('.js-tree') as HTMLElement;
+  tree = new TreeNavController(treeEl);
+  selectNav = makeSelectNav(tree);
+});
+
+afterEach(() => {
+  document.body.innerHTML = '';
+});
+
+it('creates select nav from tree', () => {
+  expect(selectNav).toMatchSnapshot();
+});
diff --git a/static/shared/outline/select.ts b/static/shared/outline/select.ts
new file mode 100644
index 0000000..9f56211
--- /dev/null
+++ b/static/shared/outline/select.ts
@@ -0,0 +1,61 @@
+/**
+ * @license
+ * Copyright 2021 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+import { TreeNavController } from './tree.js';
+
+export class SelectNavController {
+  constructor(private el: Element) {
+    this.el.addEventListener('change', e => {
+      const target = e.target as HTMLSelectElement;
+      let href = target.value;
+      if (!target.value.startsWith('/')) {
+        href = '/' + href;
+      }
+      window.location.href = href;
+    });
+  }
+}
+
+export function makeSelectNav(tree: TreeNavController): HTMLLabelElement {
+  const label = document.createElement('label');
+  label.classList.add('go-Label');
+  label.setAttribute('aria-label', 'Menu');
+  const select = document.createElement('select');
+  select.classList.add('go-Select', 'js-selectNav');
+  label.appendChild(select);
+  const outline = document.createElement('optgroup');
+  outline.label = 'Outline';
+  select.appendChild(outline);
+  const groupMap: Record<string, HTMLOptGroupElement> = {};
+  let group: HTMLOptGroupElement;
+  for (const t of tree.treeitems) {
+    if (Number(t.depth) > 4) continue;
+    if (t.groupTreeitem) {
+      group = groupMap[t.groupTreeitem.label];
+      if (!group) {
+        group = groupMap[t.groupTreeitem.label] = document.createElement('optgroup');
+        group.label = t.groupTreeitem.label;
+        select.appendChild(group);
+      }
+    } else {
+      group = outline;
+    }
+    const o = document.createElement('option');
+    o.label = t.label;
+    o.textContent = t.label;
+    o.value = (t.el as HTMLAnchorElement).href.replace(window.location.origin, '').replace('/', '');
+    group.appendChild(o);
+  }
+  tree.addObserver(t => {
+    const hash = (t.el as HTMLAnchorElement).hash;
+    const value = select.querySelector<HTMLOptionElement>(`[value$="${hash}"]`)?.value;
+    if (value) {
+      select.value = value;
+    }
+  }, 50);
+  return label;
+}
diff --git a/static/shared/outline/tree.css b/static/shared/outline/tree.css
new file mode 100644
index 0000000..3dd1e40
--- /dev/null
+++ b/static/shared/outline/tree.css
@@ -0,0 +1,119 @@
+/*!
+ * Copyright 2021 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+.go-Tree {
+  --js-tree-height: 0;
+
+  display: flex;
+  flex-direction: column;
+}
+
+.go-Tree ul {
+  list-style: none;
+  padding-left: 0;
+}
+.go-Tree li:last-of-type {
+  padding-bottom: 0.25rem;
+}
+.go-Tree a + ul {
+  display: none;
+}
+.go-Tree a[aria-expanded='true'] + ul[role='group'] {
+  display: block;
+}
+.go-Tree a[aria-level='1'] + ul[role='group'] {
+  max-height: calc(
+    100vh - var(--js-tree-height, 0) - var(--js-sticky-header-height, 3.5rem) - 5rem
+  );
+  overflow-y: auto;
+  padding: 0.5rem 0.25rem 0 0.25rem;
+}
+.go-Tree a {
+  color: var(--color-text-subtle);
+  display: block;
+  line-height: 1.5rem;
+  overflow: hidden;
+  padding: 0.125rem 0 0.125rem 1.25rem;
+  position: relative;
+  text-overflow: ellipsis;
+  user-select: none;
+  white-space: nowrap;
+}
+.go-Tree > li > a,
+.go-Tree a[aria-level='1'] {
+  display: block;
+  font-size: 1rem;
+  font-weight: 500;
+  line-height: 2.5rem;
+  padding: 0 1rem;
+}
+.go-Tree a:focus,
+.go-Tree a:hover {
+  text-decoration: underline;
+  z-index: 1;
+}
+.go-Tree a[aria-selected='true'] {
+  color: var(--color-text);
+  font-weight: 500;
+}
+.go-Tree a[aria-level='1'][aria-selected='true'],
+.go-Tree a[aria-level='1'][aria-expanded='true'] {
+  background-color: var(--color-background-accented);
+}
+.go-Tree a[aria-level='3'][aria-expanded='true'] {
+  margin-bottom: 0.375em;
+}
+.go-Tree a[aria-level='2'] {
+  margin-bottom: 0.25rem;
+  position: relative;
+}
+.go-Tree a[aria-level='3'] {
+  padding-left: 2.5rem;
+}
+.go-Tree a[aria-level='4'] {
+  border-left: 0.125rem solid var(--color-background-accented);
+  margin-left: 2.5rem;
+  padding-left: 0.5rem;
+}
+.go-Tree a[aria-selected='true'][aria-level='2']:not([aria-expanded])::before,
+.go-Tree a[aria-selected='true'][aria-level='3']:not([aria-expanded])::before {
+  background-color: var(--color-brand-primary);
+  border-radius: 50%;
+  content: '';
+  display: block;
+  height: 0.3125rem;
+  left: 0.4688rem;
+  position: absolute;
+  top: 0.75rem;
+  width: 0.3125rem;
+}
+.go-Tree a[aria-expanded][aria-owns][aria-level='2']::before,
+.go-Tree a[aria-expanded][aria-owns][aria-level='3']::before {
+  border-bottom: 0.25rem solid transparent;
+  border-left: 0.25rem solid var(--color-border);
+  border-right: 0;
+  border-top: 0.25rem solid transparent;
+  content: '';
+  display: block;
+  height: 0;
+  left: 0.5rem;
+  position: absolute;
+  top: 0.625rem;
+  transition: transform 0.1s linear;
+  width: 0;
+}
+.go-Tree a[aria-expanded='true'][aria-level='2']::before,
+.go-Tree a[aria-expanded='true'][aria-level='3']::before {
+  transform: rotate(90deg);
+}
+.go-Tree a[aria-expanded][aria-level='3']:not([empty])::before,
+.go-Tree a[aria-selected][aria-level='3']:not([empty])::before {
+  left: 1.5rem;
+  top: 0.75rem;
+}
+.go-Tree a[aria-selected='true'][aria-level='4'] {
+  border-left: 0.125rem solid var(--color-brand-primary);
+}
diff --git a/static/shared/outline/tree.test.ts b/static/shared/outline/tree.test.ts
new file mode 100644
index 0000000..9b5d243
--- /dev/null
+++ b/static/shared/outline/tree.test.ts
@@ -0,0 +1,162 @@
+/**
+ * @license
+ * Copyright 2021 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+import { parse } from '../../markdown';
+import { TreeNavController } from './tree';
+
+const observe = jest.fn();
+window.IntersectionObserver = jest.fn(() => ({
+  observe,
+})) as any;
+
+let treeEl: HTMLElement;
+let a1: HTMLElement;
+let a21: HTMLElement;
+let a22: HTMLElement;
+let a23: HTMLElement;
+let a31: HTMLElement;
+let a41: HTMLElement;
+let a42: HTMLElement;
+
+beforeEach(async () => {
+  document.body.innerHTML = await parse(__dirname + '/outline.md');
+  treeEl = document.querySelector('.js-tree') as HTMLElement;
+  new TreeNavController(treeEl);
+  a1 = a('#one');
+  a21 = a('#two-one');
+  a22 = a('#two-two');
+  a23 = a('#two-three');
+  a31 = a('#three-one');
+  a41 = a('#four-one');
+  a42 = a('#four-two');
+  a1.focus();
+});
+
+afterEach(() => {
+  document.body.innerHTML = '';
+});
+
+it('creates tree nav from ul', () => {
+  expect(treeEl).toMatchSnapshot();
+});
+
+it('adds role=group attribute to ul elements', () => {
+  for (const ul of treeEl.querySelectorAll('ul')) {
+    expect(attr(ul, 'role')).toBe('group');
+  }
+});
+
+it('adds role=none attribute to li elements', () => {
+  for (const ul of treeEl.querySelectorAll('li')) {
+    expect(attr(ul, 'role')).toBe('none');
+  }
+});
+
+it('adds role=treeitem attribute to a elements', () => {
+  for (const ul of treeEl.querySelectorAll('a')) {
+    expect(attr(ul, 'role')).toBe('treeitem');
+  }
+});
+
+it('adds aria-expanded role to tree items with children', () => {
+  expect(attr(a1, 'aria-expanded')).toBe('false');
+  expect(attr(a22, 'aria-expanded')).toBe('false');
+  expect(attr(a31, 'aria-expanded')).toBe('false');
+});
+
+it('does not add aria-expanded role to tree items with children', () => {
+  expect(attr(a21, 'aria-expanded')).toBeNull();
+  expect(attr(a41, 'aria-expanded')).toBeNull();
+  expect(attr(a42, 'aria-expanded')).toBeNull();
+});
+
+it('adds aria-level to tree items', () => {
+  expect(attr(a1, 'aria-level')).toBe('1');
+  expect(attr(a21, 'aria-level')).toBe('2');
+  expect(attr(a22, 'aria-level')).toBe('2');
+  expect(attr(a31, 'aria-level')).toBe('3');
+  expect(attr(a41, 'aria-level')).toBe('4');
+  expect(attr(a42, 'aria-level')).toBe('4');
+});
+
+it('focuses tree item on click', () => {
+  a1.click();
+  expect(attr(a1, 'aria-expanded')).toBe('true');
+  expect(attr(a1, 'aria-selected')).toBe('true');
+});
+
+it('closes unfocused branches', () => {
+  a1.click();
+  expect(attr(a1, 'aria-expanded')).toBe('true');
+  expect(attr(a1, 'aria-selected')).toBe('true');
+  a22.click();
+  expect(attr(a22, 'aria-expanded')).toBe('true');
+  expect(attr(a22, 'aria-selected')).toBe('true');
+  a21.click();
+  expect(attr(a22, 'aria-expanded')).toBe('false');
+  expect(attr(a22, 'aria-selected')).toBe('false');
+});
+
+it('navigates treeitems with the keyboard', () => {
+  keydown(a1, 'ArrowRight'); // expand a1
+  expect(attr(a1, 'aria-expanded')).toBe('true');
+
+  keydown(a1, 'ArrowRight'); // focus a21
+  expect(attr(a1, 'tabindex')).toBe('-1');
+  expect(attr(a21, 'tabindex')).toBe('0');
+
+  keydown(a21, 'ArrowDown'); // focus a22
+  expect(attr(a21, 'tabindex')).toBe('-1');
+  expect(attr(a22, 'tabindex')).toBe('0');
+
+  keydown(a22, 'ArrowRight'); // expand a22
+  expect(attr(a22, 'aria-expanded')).toBe('true');
+
+  keydown(a22, 'ArrowRight'); // focus a31
+  expect(attr(a22, 'tabindex')).toBe('-1');
+  expect(attr(a31, 'tabindex')).toBe('0');
+
+  keydown(a31, 'ArrowUp'); // focus a22
+  expect(attr(a31, 'tabindex')).toBe('-1');
+  expect(attr(a22, 'tabindex')).toBe('0');
+
+  keydown(a22, 'ArrowUp'); // focus a21
+  expect(attr(a22, 'tabindex')).toBe('-1');
+  expect(attr(a21, 'tabindex')).toBe('0');
+
+  keydown(a21, 'ArrowLeft'); // focus a1
+  expect(attr(a21, 'tabindex')).toBe('-1');
+  expect(attr(a1, 'tabindex')).toBe('0');
+
+  keydown(a1, 'End'); // focus a31
+  expect(attr(a1, 'tabindex')).toBe('-1');
+  expect(attr(a23, 'tabindex')).toBe('0');
+
+  keydown(a23, 'Home'); // focus a1
+  expect(attr(a31, 'tabindex')).toBe('-1');
+  expect(attr(a1, 'tabindex')).toBe('0');
+});
+
+it('expands sibling items with * key', () => {
+  keydown(a1, 'ArrowRight');
+  keydown(a1, 'ArrowDown');
+  keydown(a21, '*');
+  expect(attr(a22, 'aria-expanded')).toBe('true');
+  expect(attr(a23, 'aria-expanded')).toBe('true');
+});
+
+function a(href: string): HTMLElement {
+  return document.querySelector(`[href="${href}"]`);
+}
+
+function attr(el: Element, name: string): string {
+  return el.getAttribute(name);
+}
+
+function keydown(el: Element, key: string): void {
+  el.dispatchEvent(new KeyboardEvent('keydown', { key }));
+}
diff --git a/static/shared/outline/tree.tmpl b/static/shared/outline/tree.tmpl
new file mode 100644
index 0000000..6f048f9
--- /dev/null
+++ b/static/shared/outline/tree.tmpl
@@ -0,0 +1,24 @@
+<!--
+  Copyright 2021 The Go Authors. All rights reserved.
+  Use of this source code is governed by a BSD-style
+  license that can be found in the LICENSE file.
+-->
+
+{{define "treeitems"}}
+  {{range .}}
+    <li>
+      <a href="#{{.ID}}">{{.Text}}</a>
+      {{if and .Children (lt .Level 4)}}
+        <ul>
+          {{template "treeitems" .Children}}
+        </ul>
+      {{end}}
+    </li>
+  {{end}}
+{{end}}
+
+{{define "tree-nav"}}
+  <ul class="go-Tree js-tree" role="tree">
+    {{template "treeitems" .}}
+  </ul>
+{{end}}
diff --git a/static/shared/outline/tree.ts b/static/shared/outline/tree.ts
new file mode 100644
index 0000000..fbacbe0
--- /dev/null
+++ b/static/shared/outline/tree.ts
@@ -0,0 +1,483 @@
+/**
+ * @license
+ * Copyright 2021 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+/**
+ * TreeNavController is the navigation tree component of the documentation page.
+ * It adds accessiblity attributes to a tree, observes the heading elements
+ * focus the topmost link for headings visible on the page, and implements the
+ * WAI-ARIA Treeview Design Pattern with full
+ * [keyboard support](https://www.w3.org/TR/wai-aria-practices/examples/treeview/treeview-2/treeview-2a.html#kbd_label).
+ */
+export class TreeNavController {
+  treeitems: TreeItem[];
+
+  /**
+   * firstChars is the first character of each treeitem in the same order
+   * as this.treeitems. We use this array to set focus by character when
+   * navigating the tree with a keyboard.
+   */
+  private firstChars: string[];
+  private firstTreeitem: TreeItem | null;
+  private lastTreeitem: TreeItem | null;
+  private observerCallbacks: ((t: TreeItem) => void)[];
+
+  constructor(private el: HTMLElement) {
+    this.treeitems = [];
+    this.firstChars = [];
+    this.firstTreeitem = null;
+    this.lastTreeitem = null;
+    this.observerCallbacks = [];
+    this.init();
+  }
+
+  private init(): void {
+    this.handleResize();
+    window.addEventListener('resize', this.handleResize);
+    this.findTreeItems();
+    this.updateVisibleTreeitems();
+    this.observeTargets();
+    if (this.firstTreeitem) {
+      this.firstTreeitem.el.tabIndex = 0;
+    }
+  }
+
+  private handleResize = (): void => {
+    this.el.style.setProperty('--js-tree-height', '100vh');
+    this.el.style.setProperty('--js-tree-height', this.el.clientHeight + 'px');
+  };
+
+  private observeTargets() {
+    this.addObserver(treeitem => {
+      this.expandTreeitem(treeitem);
+      this.setSelected(treeitem);
+      // TODO: Fix scroll issue in https://golang.org/issue/47450.
+      // treeitem.el.scrollIntoView({ block: 'nearest' });
+    });
+
+    const targets = new Map<string, boolean>();
+    const observer = new IntersectionObserver(
+      entries => {
+        for (const entry of entries) {
+          targets.set(entry.target.id, entry.isIntersecting || entry.intersectionRatio === 1);
+        }
+        for (const [id, isIntersecting] of targets) {
+          if (isIntersecting) {
+            const active = this.treeitems.find(t =>
+              (t.el as HTMLAnchorElement)?.href.endsWith(`#${id}`)
+            );
+            if (active) {
+              for (const fn of this.observerCallbacks) {
+                fn(active);
+              }
+            }
+            break;
+          }
+        }
+      },
+      {
+        threshold: 1.0,
+        rootMargin: '-60px 0px 0px 0px',
+      }
+    );
+
+    for (const href of this.treeitems.map(t => t.el.getAttribute('href'))) {
+      if (href) {
+        const id = href.replace(window.location.origin, '').replace('/', '').replace('#', '');
+        const target = document.getElementById(id);
+        if (target) {
+          observer.observe(target);
+        }
+      }
+    }
+  }
+
+  addObserver(fn: (t: TreeItem) => void, delay = 200): void {
+    this.observerCallbacks.push(debounce(fn, delay));
+  }
+
+  setFocusToNextItem(currentItem: TreeItem): void {
+    let nextItem = null;
+    for (let i = currentItem.index + 1; i < this.treeitems.length; i++) {
+      const ti = this.treeitems[i];
+      if (ti.isVisible) {
+        nextItem = ti;
+        break;
+      }
+    }
+    if (nextItem) {
+      this.setFocusToItem(nextItem);
+    }
+  }
+
+  setFocusToPreviousItem(currentItem: TreeItem): void {
+    let prevItem = null;
+    for (let i = currentItem.index - 1; i > -1; i--) {
+      const ti = this.treeitems[i];
+      if (ti.isVisible) {
+        prevItem = ti;
+        break;
+      }
+    }
+    if (prevItem) {
+      this.setFocusToItem(prevItem);
+    }
+  }
+
+  setFocusToParentItem(currentItem: TreeItem): void {
+    if (currentItem.groupTreeitem) {
+      this.setFocusToItem(currentItem.groupTreeitem);
+    }
+  }
+
+  setFocusToFirstItem(): void {
+    this.firstTreeitem && this.setFocusToItem(this.firstTreeitem);
+  }
+
+  setFocusToLastItem(): void {
+    this.lastTreeitem && this.setFocusToItem(this.lastTreeitem);
+  }
+
+  setSelected(currentItem: TreeItem): void {
+    for (const l1 of this.el.querySelectorAll('[aria-expanded="true"]')) {
+      if (l1 === currentItem.el) continue;
+      if (!l1.nextElementSibling?.contains(currentItem.el)) {
+        l1.setAttribute('aria-expanded', 'false');
+      }
+    }
+    for (const l1 of this.el.querySelectorAll('[aria-selected]')) {
+      if (l1 !== currentItem.el) {
+        l1.setAttribute('aria-selected', 'false');
+      }
+    }
+    currentItem.el.setAttribute('aria-selected', 'true');
+    this.updateVisibleTreeitems();
+    this.setFocusToItem(currentItem, false);
+  }
+
+  expandTreeitem(treeitem: TreeItem): void {
+    let currentItem: TreeItem | null = treeitem;
+    while (currentItem) {
+      if (currentItem.isExpandable) {
+        currentItem.el.setAttribute('aria-expanded', 'true');
+      }
+      currentItem = currentItem.groupTreeitem;
+    }
+    this.updateVisibleTreeitems();
+  }
+
+  expandAllSiblingItems(currentItem: TreeItem): void {
+    for (const ti of this.treeitems) {
+      if (ti.groupTreeitem === currentItem.groupTreeitem && ti.isExpandable) {
+        this.expandTreeitem(ti);
+      }
+    }
+  }
+
+  collapseTreeitem(currentItem: TreeItem): void {
+    let groupTreeitem = null;
+
+    if (currentItem.isExpanded()) {
+      groupTreeitem = currentItem;
+    } else {
+      groupTreeitem = currentItem.groupTreeitem;
+    }
+
+    if (groupTreeitem) {
+      groupTreeitem.el.setAttribute('aria-expanded', 'false');
+      this.updateVisibleTreeitems();
+      this.setFocusToItem(groupTreeitem);
+    }
+  }
+
+  setFocusByFirstCharacter(currentItem: TreeItem, char: string): void {
+    let start: number, index: number;
+    char = char.toLowerCase();
+
+    // Get start index for search based on position of currentItem
+    start = currentItem.index + 1;
+    if (start === this.treeitems.length) {
+      start = 0;
+    }
+
+    // Check remaining slots in the menu
+    index = this.getIndexFirstChars(start, char);
+
+    // If not found in remaining slots, check from beginning
+    if (index === -1) {
+      index = this.getIndexFirstChars(0, char);
+    }
+
+    // If match was found...
+    if (index > -1) {
+      this.setFocusToItem(this.treeitems[index]);
+    }
+  }
+
+  private findTreeItems() {
+    const findItems = (el: HTMLElement, group: TreeItem | null) => {
+      let ti = group;
+      let curr = el.firstElementChild as HTMLElement;
+      while (curr) {
+        if (curr.tagName === 'A' || curr.tagName === 'SPAN') {
+          ti = new TreeItem(curr, this, group);
+          this.treeitems.push(ti);
+          this.firstChars.push(ti.label.substring(0, 1).toLowerCase());
+        }
+        if (curr.firstElementChild) {
+          findItems(curr, ti);
+        }
+        curr = curr.nextElementSibling as HTMLElement;
+      }
+    };
+    findItems(this.el as HTMLElement, null);
+    this.treeitems.map((ti, idx) => (ti.index = idx));
+  }
+
+  private updateVisibleTreeitems(): void {
+    this.firstTreeitem = this.treeitems[0];
+
+    for (const ti of this.treeitems) {
+      let parent = ti.groupTreeitem;
+      ti.isVisible = true;
+      while (parent && parent.el !== this.el) {
+        if (!parent.isExpanded()) {
+          ti.isVisible = false;
+        }
+        parent = parent.groupTreeitem;
+      }
+      if (ti.isVisible) {
+        this.lastTreeitem = ti;
+      }
+    }
+  }
+
+  private setFocusToItem(treeitem: TreeItem, focusEl = true) {
+    treeitem.el.tabIndex = 0;
+    if (focusEl) {
+      treeitem.el.focus();
+    }
+    for (const ti of this.treeitems) {
+      if (ti !== treeitem) {
+        ti.el.tabIndex = -1;
+      }
+    }
+  }
+
+  private getIndexFirstChars(startIndex: number, char: string): number {
+    for (let i = startIndex; i < this.firstChars.length; i++) {
+      if (this.treeitems[i].isVisible && char === this.firstChars[i]) {
+        return i;
+      }
+    }
+    return -1;
+  }
+}
+
+class TreeItem {
+  el: HTMLElement;
+  groupTreeitem: TreeItem | null;
+  label: string;
+  isExpandable: boolean;
+  isVisible: boolean;
+  depth: number;
+  index: number;
+
+  private tree: TreeNavController;
+  private isInGroup: boolean;
+
+  constructor(el: HTMLElement, treeObj: TreeNavController, group: TreeItem | null) {
+    el.tabIndex = -1;
+    this.el = el;
+    this.groupTreeitem = group;
+    this.label = el.textContent?.trim() ?? '';
+    this.tree = treeObj;
+    this.depth = (group?.depth || 0) + 1;
+    this.index = 0;
+
+    const parent = el.parentElement;
+    if (parent?.tagName.toLowerCase() === 'li') {
+      parent?.setAttribute('role', 'none');
+    }
+    el.setAttribute('aria-level', this.depth + '');
+    if (el.getAttribute('aria-label')) {
+      this.label = el?.getAttribute('aria-label')?.trim() ?? '';
+    }
+
+    this.isExpandable = false;
+    this.isVisible = false;
+    this.isInGroup = !!group;
+
+    let curr = el.nextElementSibling;
+    while (curr) {
+      if (curr.tagName.toLowerCase() == 'ul') {
+        const groupId = `${group?.label ?? ''} nav group ${this.label}`.replace(/[\W_]+/g, '_');
+        el.setAttribute('aria-owns', groupId);
+        el.setAttribute('aria-expanded', 'false');
+        curr.setAttribute('role', 'group');
+        curr.setAttribute('id', groupId);
+        this.isExpandable = true;
+        break;
+      }
+
+      curr = curr.nextElementSibling;
+    }
+    this.init();
+  }
+
+  private init() {
+    this.el.tabIndex = -1;
+    if (!this.el.getAttribute('role')) {
+      this.el.setAttribute('role', 'treeitem');
+    }
+    this.el.addEventListener('keydown', this.handleKeydown.bind(this));
+    this.el.addEventListener('click', this.handleClick.bind(this));
+    this.el.addEventListener('focus', this.handleFocus.bind(this));
+    this.el.addEventListener('blur', this.handleBlur.bind(this));
+  }
+
+  isExpanded() {
+    if (this.isExpandable) {
+      return this.el.getAttribute('aria-expanded') === 'true';
+    }
+
+    return false;
+  }
+
+  isSelected() {
+    return this.el.getAttribute('aria-selected') === 'true';
+  }
+
+  private handleClick(event: MouseEvent) {
+    // only process click events that directly happened on this treeitem
+    if (event.target !== this.el && event.target !== this.el.firstElementChild) {
+      return;
+    }
+    if (this.isExpandable) {
+      if (this.isExpanded() && this.isSelected()) {
+        this.tree.collapseTreeitem(this);
+      } else {
+        this.tree.expandTreeitem(this);
+      }
+      event.stopPropagation();
+    }
+    this.tree.setSelected(this);
+  }
+
+  private handleFocus() {
+    let el = this.el;
+    if (this.isExpandable) {
+      el = (el.firstElementChild as HTMLElement) ?? el;
+    }
+    el.classList.add('focus');
+  }
+
+  private handleBlur() {
+    let el = this.el;
+    if (this.isExpandable) {
+      el = (el.firstElementChild as HTMLElement) ?? el;
+    }
+    el.classList.remove('focus');
+  }
+
+  private handleKeydown(event: KeyboardEvent) {
+    if (event.altKey || event.ctrlKey || event.metaKey) {
+      return;
+    }
+
+    let captured = false;
+    switch (event.key) {
+      case ' ':
+      case 'Enter':
+        if (this.isExpandable) {
+          if (this.isExpanded() && this.isSelected()) {
+            this.tree.collapseTreeitem(this);
+          } else {
+            this.tree.expandTreeitem(this);
+          }
+          captured = true;
+        } else {
+          event.stopPropagation();
+        }
+        this.tree.setSelected(this);
+        break;
+
+      case 'ArrowUp':
+        this.tree.setFocusToPreviousItem(this);
+        captured = true;
+        break;
+
+      case 'ArrowDown':
+        this.tree.setFocusToNextItem(this);
+        captured = true;
+        break;
+
+      case 'ArrowRight':
+        if (this.isExpandable) {
+          if (this.isExpanded()) {
+            this.tree.setFocusToNextItem(this);
+          } else {
+            this.tree.expandTreeitem(this);
+          }
+        }
+        captured = true;
+        break;
+
+      case 'ArrowLeft':
+        if (this.isExpandable && this.isExpanded()) {
+          this.tree.collapseTreeitem(this);
+          captured = true;
+        } else {
+          if (this.isInGroup) {
+            this.tree.setFocusToParentItem(this);
+            captured = true;
+          }
+        }
+        break;
+
+      case 'Home':
+        this.tree.setFocusToFirstItem();
+        captured = true;
+        break;
+
+      case 'End':
+        this.tree.setFocusToLastItem();
+        captured = true;
+        break;
+
+      default:
+        if (event.key.length === 1 && event.key.match(/\S/)) {
+          if (event.key == '*') {
+            this.tree.expandAllSiblingItems(this);
+          } else {
+            this.tree.setFocusByFirstCharacter(this, event.key);
+          }
+          captured = true;
+        }
+        break;
+    }
+
+    if (captured) {
+      event.stopPropagation();
+      event.preventDefault();
+    }
+  }
+}
+
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+function debounce<T extends (...args: any[]) => any>(func: T, wait: number) {
+  let timeout: ReturnType<typeof setTimeout> | null;
+  return (...args: Parameters<T>) => {
+    const later = () => {
+      timeout = null;
+      func(...args);
+    };
+    if (timeout) {
+      clearTimeout(timeout);
+    }
+    timeout = setTimeout(later, wait);
+  };
+}
diff --git a/static/shared/reset.css b/static/shared/reset.css
new file mode 100644
index 0000000..f5bf9bc
--- /dev/null
+++ b/static/shared/reset.css
@@ -0,0 +1,152 @@
+/*!
+ * Copyright 2021 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+/*!
+ * http://meyerweb.com/eric/tools/css/reset/
+ * v2.0 | 20110126
+ * License: none (public domain)
+ */
+
+html,
+body,
+button,
+div,
+span,
+applet,
+object,
+iframe,
+h1,
+h2,
+h3,
+h4,
+h5,
+h6,
+hr,
+input,
+p,
+blockquote,
+pre,
+a,
+abbr,
+acronym,
+address,
+big,
+cite,
+code,
+del,
+dfn,
+dialog,
+em,
+img,
+ins,
+kbd,
+q,
+s,
+samp,
+small,
+strike,
+strong,
+sub,
+sup,
+tt,
+var,
+b,
+u,
+i,
+center,
+dl,
+dt,
+dd,
+ol,
+ul,
+li,
+fieldset,
+form,
+label,
+legend,
+table,
+caption,
+tbody,
+tfoot,
+thead,
+tr,
+th,
+td,
+article,
+aside,
+canvas,
+details,
+embed,
+figure,
+figcaption,
+footer,
+header,
+hgroup,
+menu,
+nav,
+output,
+ruby,
+section,
+summary,
+time,
+mark,
+audio,
+video {
+  border: 0;
+  font: inherit;
+  font-size: 100%;
+  margin: 0;
+  padding: 0;
+  vertical-align: baseline;
+}
+
+/* HTML5 display-role reset for older browsers */
+article,
+aside,
+details,
+figcaption,
+figure,
+footer,
+header,
+hgroup,
+menu,
+nav,
+section {
+  display: block;
+}
+
+body {
+  line-height: 1;
+}
+
+ol,
+ul {
+  list-style: none;
+}
+
+blockquote,
+q {
+  quotes: none;
+}
+
+blockquote::before,
+blockquote::after,
+q::before,
+q::after {
+  content: '';
+  content: none;
+}
+
+table {
+  border-collapse: collapse;
+  border-spacing: 0;
+}
+
+*,
+::before,
+::after {
+  box-sizing: border-box;
+}
diff --git a/static/shared/shared.css b/static/shared/shared.css
new file mode 100644
index 0000000..4229bf8
--- /dev/null
+++ b/static/shared/shared.css
@@ -0,0 +1,100 @@
+/*!
+ * Copyright 2021 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+@import url('./reset.css');
+
+/**
+ * Typography should be imported first in the list below to ensure expected
+ * CSS rule inheritance on text elements.
+ */
+@import url('./typography/typography.css');
+@import url('./button/button.css');
+@import url('./breadcrumb/breadcrumb.css');
+@import url('./carousel/carousel.css');
+@import url('./chip/chip.css');
+@import url('./clipboard/clipboard.css');
+@import url('./color/color.css');
+@import url('./footer/footer.css');
+@import url('./form/form.css');
+@import url('./gopher/gopher.css');
+@import url('./header/header.css');
+@import url('./icon/icon.css');
+@import url('./message/message.css');
+@import url('./modal/modal.css');
+@import url('./outline/tree.css');
+@import url('./tabnav/tabnav.css');
+@import url('./tooltip/tooltip.css');
+
+:root {
+  /* Padding at the left and right of the viewport. */
+  --gutter: 1.5rem;
+
+  /* Margin between containers in the grid layout. */
+  --gap: 1rem;
+
+  /* The margin placed above elements scrolled to by clicking hash links. */
+  --scroll-margin: calc(
+    var(--js-sticky-header-height, 3.5rem) + var(--js-sticky-nav-height, 0) + 2rem
+  );
+
+  /* Default styles for page elements. */
+  --border: 0.0625rem solid var(--color-border);
+  --border-radius: 0.25rem;
+  --box-shadow: 0 0 0.375rem 0 rgb(0 0 0 / 25%);
+  --focus-box-shadow: 0 0 0.0625rem 0.0625rem rgb(0 112 210 / 60%);
+}
+
+@media (min-width: 50rem) {
+  :root {
+    --gap: 2rem;
+    --scroll-margin: calc(
+      var(--js-sticky-header-height, 3.5rem) + var(--js-sticky-nav-height, 0) + 1rem
+    );
+  }
+}
+
+*:target {
+  scroll-margin-top: var(--scroll-margin);
+}
+
+body {
+  background-color: var(--color-background);
+  display: flex;
+  flex-direction: column;
+  min-height: 100vh;
+  min-width: 23.5rem;
+
+  /**
+   * This is used to programatically detect whether overflow needs to be altered
+   * to prevent jitter when focusing within fixed elements on iOS.
+   * It also must be set to 'touch' for the fix to work.
+   */
+  -webkit-overflow-scrolling: touch;
+}
+
+.go-Container {
+  display: flex;
+  flex-direction: column;
+  flex-grow: 1;
+  height: 100%;
+  margin-bottom: 5rem;
+}
+
+.go-Content {
+  display: flex;
+  flex-flow: column;
+  gap: 1rem;
+  margin: 0 auto;
+  max-width: 63rem;
+  min-height: 32rem;
+  padding: 2rem var(--gutter);
+  width: 100%;
+}
+
+.go-Content--center {
+  justify-content: center;
+  margin: auto;
+}
diff --git a/static/shared/table/table.test.ts b/static/shared/table/table.test.ts
new file mode 100644
index 0000000..681bc01
--- /dev/null
+++ b/static/shared/table/table.test.ts
@@ -0,0 +1,150 @@
+/*!
+ * @license
+ * Copyright 2020 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+import { ExpandableRowsTableController } from './table';
+
+describe('ExpandableRowsTableController', () => {
+  let table: HTMLTableElement;
+  let toggle1: HTMLButtonElement;
+  let toggle2: HTMLButtonElement;
+  let toggleAll: HTMLButtonElement;
+
+  beforeEach(() => {
+    document.body.innerHTML = `
+      <div>
+        <button class="js-toggleAll">Expand all</button>
+      </div>
+      <table class="js-table">
+        <tbody>
+          <tr>
+            <th>Toggle</th>
+            <th>Foo</th>
+            <th>Bar</th>
+          </tr>
+          <tr>
+            <td></td>
+            <td data-id="label-id-1">Hello World</td>
+            <td>Simple row with no toggle or hidden elements</td>
+          </tr>
+          <tr data-aria-controls="hidden-row-id-1 hidden-row-id-2">
+            <td>
+              <button
+                type="button"
+                aria-expanded="false"
+                aria-label="2 more from"
+                data-aria-controls="hidden-row-id-1 hidden-row-id-2"
+                data-aria-labelledby="toggle-id-1 label-id-2"
+                data-id="toggle-id-1"
+              >
+                +
+              </button>
+            </td>
+            <td data-id="label-id-2">
+              <span>Baz</span>
+            </td>
+            <td></td>
+          </tr>
+          <tr data-id="hidden-row-id-1">
+            <td></td>
+            <td>First hidden row</td>
+            <td></td>
+          </tr>
+          <tr data-id="hidden-row-id-2">
+            <td></td>
+            <td>Second hidden row</td>
+            <td></td>
+          </tr>
+          <tr data-aria-controls="hidden-row-id-3">
+            <td>
+              <button
+                type="button"
+                aria-expanded="false"
+                aria-label="2 more from"
+                data-aria-controls="hidden-row-id-3"
+                data-aria-labelledby="toggle-id-2 label-id-3"
+                data-id="toggle-id-2"
+              >
+                +
+              </button>
+            </td>
+            <td data-id="label-id-3">
+              <span>Baz</span>
+            </td>
+            <td></td>
+          </tr>
+          <tr data-id="hidden-row-id-3">
+            <td></td>
+            <td>First hidden row</td>
+            <td></td>
+          </tr>
+        </tbody>
+      </table>
+    `;
+    table = document.querySelector<HTMLTableElement>('.js-table');
+    toggleAll = document.querySelector<HTMLButtonElement>('.js-toggleAll');
+    new ExpandableRowsTableController(table, toggleAll);
+    toggle1 = document.querySelector<HTMLButtonElement>('#toggle-id-1');
+    toggle2 = document.querySelector<HTMLButtonElement>('#toggle-id-2');
+  });
+
+  afterEach(() => {
+    document.body.innerHTML = '';
+  });
+
+  it('sets data-aria-* and data-id attributes to regular html attributes', () => {
+    expect(document.querySelector('#label-id-1')).toBeTruthy();
+    expect(
+      document.querySelector('[aria-controls="hidden-row-id-1 hidden-row-id-2"]')
+    ).toBeTruthy();
+    expect(document.querySelector('[aria-labelledby="toggle-id-1 label-id-2"]')).toBeTruthy();
+    expect(document.querySelector('#toggle-id-1')).toBeTruthy();
+    expect(document.querySelector('#label-id-2')).toBeTruthy();
+    expect(document.querySelector('#hidden-row-id-1')).toBeTruthy();
+    expect(document.querySelector('#hidden-row-id-2')).toBeTruthy();
+  });
+
+  it('hides rows with unexpanded toggles', () => {
+    expect(document.querySelector('#hidden-row-id-1').classList).toContain('hidden');
+    expect(document.querySelector('#hidden-row-id-2').classList).toContain('hidden');
+  });
+
+  it('shows rows with expanded toggles', () => {
+    toggleAll.click();
+    expect(document.querySelector('#hidden-row-id-1').classList).toContain('visible');
+    expect(document.querySelector('#hidden-row-id-2').classList).toContain('visible');
+  });
+
+  it('expands rows when entering text search', () => {
+    document.dispatchEvent(new KeyboardEvent('keydown', { key: 'f', ctrlKey: true }));
+    expect(document.querySelector('#hidden-row-id-1').classList).toContain('visible');
+    expect(document.querySelector('#hidden-row-id-2').classList).toContain('visible');
+  });
+
+  it('toggle expands and collapses all elements', async () => {
+    jest.useFakeTimers();
+    toggleAll.click();
+    jest.runAllTimers();
+    expect(document.querySelector('#hidden-row-id-1').classList).toContain('visible');
+    expect(document.querySelector('#hidden-row-id-2').classList).toContain('visible');
+    expect(toggleAll.innerText).toBe('Collapse all');
+    toggleAll.click();
+    jest.runAllTimers();
+    expect(document.querySelector('#hidden-row-id-1').classList).toContain('hidden');
+    expect(document.querySelector('#hidden-row-id-2').classList).toContain('hidden');
+    expect(toggleAll.innerText).toBe('Expand all');
+  });
+
+  it('toggle changes text only when all items expanded', () => {
+    jest.useFakeTimers();
+    toggle1.click();
+    jest.runAllTimers();
+    expect(toggleAll.innerText).toBe('Expand all');
+    toggle2.click();
+    jest.runAllTimers();
+    expect(toggleAll.innerText).toBe('Collapse all');
+  });
+});
diff --git a/static/shared/table/table.ts b/static/shared/table/table.ts
new file mode 100644
index 0000000..7675b65
--- /dev/null
+++ b/static/shared/table/table.ts
@@ -0,0 +1,126 @@
+/*!
+ * @license
+ * Copyright 2020 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+/**
+ * Controller for a table element with expandable rows. Adds event listeners to
+ * a toggle within a table row that controls visiblity of additional related
+ * rows in the table.
+ *
+ * @example
+ * ```typescript
+ * import {ExpandableRowsTableController} from '/static/js/table';
+ *
+ * const el = document .querySelector<HTMLTableElement>('.js-myTableElement')
+ * new ExpandableRowsTableController(el));
+ * ```
+ */
+export class ExpandableRowsTableController {
+  private rows: HTMLTableRowElement[];
+  private toggles: HTMLButtonElement[];
+
+  /**
+   * Create a table controller.
+   * @param table - The table element to which the controller binds.
+   */
+  constructor(private table: HTMLTableElement, private toggleAll?: HTMLButtonElement | null) {
+    this.rows = Array.from(table.querySelectorAll<HTMLTableRowElement>('[data-aria-controls]'));
+    this.toggles = Array.from(this.table.querySelectorAll('[aria-expanded]'));
+    this.setAttributes();
+    this.attachEventListeners();
+    this.update();
+  }
+
+  /**
+   * setAttributes sets data-aria-* and data-id attributes to regular
+   * html attributes as a workaround for limitations from safehtml.
+   */
+  private setAttributes() {
+    for (const a of ['data-aria-controls', 'data-aria-labelledby', 'data-id']) {
+      this.table.querySelectorAll(`[${a}]`).forEach(t => {
+        t.setAttribute(a.replace('data-', ''), t.getAttribute(a) ?? '');
+        t.removeAttribute(a);
+      });
+    }
+  }
+
+  private attachEventListeners() {
+    this.rows.forEach(t => {
+      t.addEventListener('click', e => {
+        this.handleToggleClick(e);
+      });
+    });
+    this.toggleAll?.addEventListener('click', () => {
+      this.expandAllItems();
+    });
+
+    document.addEventListener('keydown', e => {
+      if ((e.ctrlKey || e.metaKey) && e.key === 'f') {
+        this.expandAllItems();
+      }
+    });
+  }
+
+  private handleToggleClick(e: MouseEvent) {
+    let target = e.currentTarget as HTMLTableRowElement | null;
+    if (!target?.hasAttribute('aria-expanded')) {
+      target = this.table.querySelector(
+        `button[aria-controls="${target?.getAttribute('aria-controls')}"]`
+      );
+    }
+    const isExpanded = target?.getAttribute('aria-expanded') === 'true';
+    target?.setAttribute('aria-expanded', isExpanded ? 'false' : 'true');
+    e.stopPropagation();
+    this.update();
+  }
+
+  expandAllItems = (): void => {
+    this.toggles.map(t => t.setAttribute('aria-expanded', 'true'));
+    this.update();
+  };
+
+  private collapseAllItems = () => {
+    this.toggles.map(t => t.setAttribute('aria-expanded', 'false'));
+    this.update();
+  };
+
+  private update = () => {
+    this.updateVisibleItems();
+    setTimeout(() => this.updateGlobalToggle());
+  };
+
+  private updateVisibleItems() {
+    this.rows.map(t => {
+      const isExpanded = t?.getAttribute('aria-expanded') === 'true';
+      const rowIds = t?.getAttribute('aria-controls')?.trimEnd().split(' ');
+      rowIds?.map(id => {
+        const target = document.getElementById(`${id}`);
+        if (isExpanded) {
+          target?.classList.add('visible');
+          target?.classList.remove('hidden');
+        } else {
+          target?.classList.add('hidden');
+          target?.classList.remove('visible');
+        }
+      });
+    });
+  }
+
+  private updateGlobalToggle() {
+    if (!this.toggleAll) return;
+    if (this.rows.some(t => t.hasAttribute('aria-expanded'))) {
+      this.toggleAll.style.display = 'block';
+    }
+    const someCollapsed = this.toggles.some(el => el.getAttribute('aria-expanded') === 'false');
+    if (someCollapsed) {
+      this.toggleAll.innerText = 'Expand all';
+      this.toggleAll.onclick = this.expandAllItems;
+    } else {
+      this.toggleAll.innerText = 'Collapse all';
+      this.toggleAll.onclick = this.collapseAllItems;
+    }
+  }
+}
diff --git a/static/shared/tabnav/tabnav.css b/static/shared/tabnav/tabnav.css
new file mode 100644
index 0000000..b669fb7
--- /dev/null
+++ b/static/shared/tabnav/tabnav.css
@@ -0,0 +1,37 @@
+/*!
+ * Copyright 2021 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+.go-TabNav {
+  margin: 0 0 0.5rem 0;
+}
+.go-TabNav ul {
+  display: flex;
+  gap: 2rem;
+}
+.go-TabNav li {
+  border-bottom: 0.25rem transparent solid;
+  display: flex;
+  font-size: 1rem;
+  height: 2.375rem;
+  padding: 0 0.25rem;
+}
+.go-TabNav li[aria-current] {
+  border-color: var(--color-brand-primary);
+}
+.go-TabNav li:hover {
+  border-color: var(--color-brand-primary);
+}
+.go-TabNav a {
+  align-items: center;
+  color: var(--color-text-subtle);
+  display: inline-flex;
+}
+.go-TabNav li:hover a {
+  text-decoration: none;
+}
+.go-TabNav li[aria-current] a {
+  color: var(--color-text);
+}
diff --git a/static/shared/tabnav/tabnav.md b/static/shared/tabnav/tabnav.md
new file mode 100644
index 0000000..fa42c72
--- /dev/null
+++ b/static/shared/tabnav/tabnav.md
@@ -0,0 +1,13 @@
+## Tab Nav
+
+---
+
+```html
+<nav class="go-TabNav">
+  <ul>
+    <li aria-current="page"><a href="#nav-tab">Package</a></li>
+    <li><a href="#nav-tab">Symbol</a></li>
+  </ul>
+  <hr />
+</nav>
+```
diff --git a/static/shared/tooltip/tooltip.css b/static/shared/tooltip/tooltip.css
new file mode 100644
index 0000000..df6e23c
--- /dev/null
+++ b/static/shared/tooltip/tooltip.css
@@ -0,0 +1,37 @@
+/*!
+ * Copyright 2021 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+.go-Tooltip {
+  border-radius: var(--border-radius);
+  cursor: pointer;
+  display: inline-block;
+  position: relative;
+}
+.go-Tooltip > summary {
+  list-style: none;
+}
+.go-Tooltip > summary::-webkit-details-marker,
+.go-Tooltip > summary::marker {
+  display: none;
+}
+.go-Tooltip > summary > img {
+  vertical-align: text-bottom;
+}
+.go-Tooltip p {
+  background: var(--color-background) 80%;
+  border: var(--border);
+  border-radius: var(--border-radius);
+  color: var(--color-text);
+  font-size: 0.75rem;
+  letter-spacing: 0.01875rem;
+  line-height: 1rem;
+  padding: 0.5rem;
+  position: absolute;
+  top: 1.5rem;
+  white-space: normal;
+  width: 12rem;
+  z-index: 100;
+}
diff --git a/static/shared/tooltip/tooltip.md b/static/shared/tooltip/tooltip.md
new file mode 100644
index 0000000..7c6dc2c
--- /dev/null
+++ b/static/shared/tooltip/tooltip.md
@@ -0,0 +1,22 @@
+## Tooltips
+
+---
+
+```html
+<details class="go-Tooltip js-tooltip" data-gtmc="tooltip">
+  <summary>
+    Valid <a href="#tooltips">go.mod</a> file
+    <img
+      class="go-Icon"
+      height="24"
+      width="24"
+      src="/static/shared/icon/help_gm_grey_24dp.svg"
+      alt=""
+    />
+  </summary>
+  <p>
+    The Go module system was introduced in Go 1.11 and is the official dependency management
+    solution for Go.
+  </p>
+</details>
+```
diff --git a/static/shared/tooltip/tooltip.test.ts b/static/shared/tooltip/tooltip.test.ts
new file mode 100644
index 0000000..a9086bc
--- /dev/null
+++ b/static/shared/tooltip/tooltip.test.ts
@@ -0,0 +1,40 @@
+/**
+ * @license
+ * Copyright 2021 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+import { parse } from '../../markdown';
+import { ToolTipController } from './tooltip';
+
+describe('Tooltip', () => {
+  let tooltip: HTMLDetailsElement;
+  let summary: HTMLElement;
+
+  beforeEach(async () => {
+    document.body.innerHTML = await parse(__dirname + '/tooltip.md');
+    tooltip = document.querySelector('.js-tooltip');
+    summary = tooltip.firstElementChild as HTMLElement;
+    new ToolTipController(tooltip);
+    summary.click();
+  });
+
+  afterEach(() => {
+    document.body.innerHTML = '';
+  });
+
+  it('opens', () => {
+    expect(tooltip.open).toBeTruthy();
+  });
+
+  it('closes on click', () => {
+    summary.click();
+    expect(tooltip.open).toBeFalsy();
+  });
+
+  it('closes on outside click', () => {
+    document.body.click();
+    expect(tooltip.open).toBeFalsy();
+  });
+});
diff --git a/static/shared/tooltip/tooltip.ts b/static/shared/tooltip/tooltip.ts
new file mode 100644
index 0000000..c45dcd2
--- /dev/null
+++ b/static/shared/tooltip/tooltip.ts
@@ -0,0 +1,20 @@
+/**
+ * @license
+ * Copyright 2021 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+/**
+ * ToolTipController handles closing tooltips on external clicks.
+ */
+export class ToolTipController {
+  constructor(private el: HTMLDetailsElement) {
+    document.addEventListener('click', e => {
+      const insideTooltip = this.el.contains(e.target as Element);
+      if (!insideTooltip) {
+        this.el.removeAttribute('open');
+      }
+    });
+  }
+}
diff --git a/static/shared/typography/typography.css b/static/shared/typography/typography.css
new file mode 100644
index 0000000..2b656b1
--- /dev/null
+++ b/static/shared/typography/typography.css
@@ -0,0 +1,119 @@
+/*!
+ * Copyright 2021 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+body {
+  color: var(--color-text);
+  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif,
+    'Apple Color Emoji', 'Segoe UI Emoji';
+  font-size: 1rem;
+  line-height: normal;
+}
+h1 {
+  font-size: 1.5rem;
+}
+h2 {
+  font-size: 1.375rem;
+}
+h3 {
+  font-size: 1.25rem;
+}
+h4 {
+  font-size: 1.125rem;
+}
+h5 {
+  font-size: 1rem;
+}
+h6 {
+  font-size: 0.875rem;
+}
+
+h1,
+h2,
+h3,
+h4 {
+  font-weight: 600;
+  line-height: 1.25em;
+  word-break: break-word;
+}
+h5,
+h6 {
+  font-weight: 500;
+  line-height: 1.3em;
+  word-break: break-word;
+}
+
+hr {
+  border: none;
+  border-bottom: var(--border);
+  margin: 0;
+  width: 100%;
+}
+
+p {
+  font-size: 1rem;
+  line-height: 1.5rem;
+  max-width: 60rem;
+}
+strong {
+  font-weight: 600;
+}
+
+.go-textSubtle {
+  color: var(--color-text-subtle);
+}
+.go-textTitle {
+  font-size: 1.125rem;
+  font-weight: 600;
+  line-height: 1.25rem;
+}
+.go-textLabel {
+  font-size: 0.875rem;
+  font-weight: 600;
+  line-height: 1rem;
+}
+.go-textPagination {
+  font-size: 0.875rem;
+  line-height: 1rem;
+}
+code,
+pre,
+textarea.code {
+  font-family: SFMono-Regular, Consolas, Liberation Mono, Menlo, monospace;
+  font-size: 0.875rem;
+  line-height: 1.5em;
+}
+pre,
+textarea.code {
+  background-color: var(--color-background-accented);
+  border: var(--border);
+  border-radius: var(--border-radius);
+  color: var(--color-text);
+  overflow-x: auto;
+  padding: 0.625rem;
+  tab-size: 4;
+  white-space: pre;
+}
+
+button,
+input,
+select,
+textarea {
+  font: inherit;
+}
+
+a,
+a:link,
+a:visited {
+  color: var(--color-brand-primary);
+  text-decoration: none;
+}
+a:hover {
+  color: var(--color-brand-primary);
+  text-decoration: underline;
+}
+a:hover > * {
+  text-decoration: underline;
+}
diff --git a/static/shared/typography/typography.md b/static/shared/typography/typography.md
new file mode 100644
index 0000000..7bd0fee
--- /dev/null
+++ b/static/shared/typography/typography.md
@@ -0,0 +1,55 @@
+## Typography
+
+---
+
+```html {#h1}
+<h1>Heading 1</h1>
+```
+
+```html {#h2}
+<h2>Heading 2</h2>
+```
+
+```html {#h3}
+<h3>Heading 3</h3>
+```
+
+```html {#h4}
+<h4>Heading 4</h4>
+```
+
+```html {#h5}
+<h5>Heading 5</h5>
+```
+
+```html {#h6}
+<h6>Heading 6</h6>
+```
+
+```html {#paragraph}
+<p>Paragraph</p>
+```
+
+```html {#subtle-text}
+<div class="go-textSubtle">Subtle text</div>
+```
+
+```html {#label-text}
+<div class="go-textLabel">Label text</div>
+```
+
+```html {#pagination-text}
+<div class="go-textPagination">Pagination text</div>
+```
+
+```html {#code-text}
+<code>Code text</code>
+```
+
+```html {#pre-text}
+<pre>Preformated text</pre>
+```
+
+```html {#link-text}
+<a href="#typography" data-gtmc="_ link">Link</a>
+```
diff --git a/static/shared/vuln/vuln.tmpl b/static/shared/vuln/vuln.tmpl
new file mode 100644
index 0000000..40a03a6
--- /dev/null
+++ b/static/shared/vuln/vuln.tmpl
@@ -0,0 +1,18 @@
+<!--
+  Copyright 2021 The Go Authors. All rights reserved.
+  Use of this source code is governed by a BSD-style
+  license that can be found in the LICENSE file.
+-->
+
+{{define "vuln-message"}}
+  <div class="go-Message go-Message--alert">
+    <img
+        class="go-Icon"
+        height="24"
+        width="24"
+        src="/static/shared/icon/alert_gm_grey_24dp.svg"
+        alt="Alert"
+    />&nbsp;
+    <a href="/vuln/{{.ID}}">{{.ID}}</a>: {{.Details}}
+  </div>
+{{end}}