diff --git a/godev/.eslintignore b/godev/.eslintignore
new file mode 100644
index 0000000..65596ba
--- /dev/null
+++ b/godev/.eslintignore
@@ -0,0 +1 @@
+third_party
\ No newline at end of file
diff --git a/godev/.prettierignore b/godev/.prettierignore
new file mode 100644
index 0000000..65596ba
--- /dev/null
+++ b/godev/.prettierignore
@@ -0,0 +1 @@
+third_party
\ No newline at end of file
diff --git a/godev/README.md b/godev/README.md
index 7af97b9..fa06aa3 100644
--- a/godev/README.md
+++ b/godev/README.md
@@ -27,3 +27,13 @@
 ### Run ESLint, Stylelint, & Prettier
 
     ./npm run all
+
+## Third Party
+
+The `third_party` directory was generated with `go run ./devtools/cmd/npmdeps`.
+It contains JS  packages that are served by the web site. To add or upgrade a
+new dependency use the necessary `./npm` command then run
+`go run ./devtools/cmd/npmdeps`. Remove unnecessary files from the copy result
+where appropriate. For example, `content/localserver/index.html` only depends
+on files from `third_party/d3@7.8.4/dist/` so the directory
+`third_party/d3@7.8.4/src` can be deleted.
diff --git a/godev/content.go b/godev/content.go
index d9c1b06..7e2f109 100644
--- a/godev/content.go
+++ b/godev/content.go
@@ -9,5 +9,5 @@
 	"embed"
 )
 
-//go:embed content
+//go:embed content third_party
 var FS embed.FS
diff --git a/godev/devtools/cmd/npmdeps/main.go b/godev/devtools/cmd/npmdeps/main.go
new file mode 100644
index 0000000..5f110b1
--- /dev/null
+++ b/godev/devtools/cmd/npmdeps/main.go
@@ -0,0 +1,103 @@
+// Copyright 2023 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.
+
+// npmdeps copies npm dependencies to be served by the website into the
+// third_party directory. It reads the package.json file to get the list
+// of dependencies to copy.
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+const (
+	pkgjsonfile = "package.json"
+	source      = "node_modules"
+	destination = "third_party"
+)
+
+var files = []string{"LICENSE", "package.json"}
+
+type metadata struct {
+	Dependencies map[string]string `json:"dependencies"`
+	Exports      map[string]string `json:"exports"`
+}
+
+func run() error {
+	f, err := os.ReadFile(pkgjsonfile)
+	if err != nil {
+		return err
+	}
+	var pkgjson metadata
+	if err := json.Unmarshal(f, &pkgjson); err != nil {
+		return err
+	}
+	if err := os.RemoveAll(destination); err != nil {
+		return err
+	}
+	for name, version := range pkgjson.Dependencies {
+		src := filepath.Join(source, name)
+		// Added version to the path for long term caching.
+		dest := filepath.Join(destination, name+"@"+version)
+		org, rest, found := strings.Cut(name, "/")
+		if found {
+			dest = filepath.Join(destination, org, rest+"@"+version)
+		}
+		f, err := os.ReadFile(filepath.Join(src, pkgjsonfile))
+		if err != nil {
+			return err
+		}
+		var dependency metadata
+		if err := json.Unmarshal(f, &dependency); err != nil {
+			return err
+		}
+		for _, name := range files {
+			if err := copy(filepath.Join(src, name), filepath.Join(dest, name)); err != nil {
+				return err
+			}
+		}
+		umd := dependency.Exports["umd"]
+		if err := copy(filepath.Join(src, umd), filepath.Join(dest, umd)); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func copy(from, to string) error {
+	stat, err := os.Stat(from)
+	if err != nil {
+		return err
+	}
+	if !stat.Mode().IsRegular() {
+		return fmt.Errorf("%s is not a regular file", from)
+	}
+	src, err := os.Open(from)
+	if err != nil {
+		return err
+	}
+	defer src.Close()
+	if err := os.MkdirAll(filepath.Dir(to), os.ModePerm); err != nil {
+		return err
+	}
+	dst, err := os.Create(to)
+	if err != nil {
+		return err
+	}
+	defer dst.Close()
+	_, err = io.Copy(dst, src)
+	return err
+}
+
+func main() {
+	if err := run(); err != nil {
+		log.Fatal(err)
+	}
+}
diff --git a/godev/package-lock.json b/godev/package-lock.json
index 8e4d5a2..0cee1c1 100644
--- a/godev/package-lock.json
+++ b/godev/package-lock.json
@@ -4,6 +4,10 @@
   "requires": true,
   "packages": {
     "": {
+      "dependencies": {
+        "@observablehq/plot": "0.6.6",
+        "d3": "7.8.4"
+      },
       "devDependencies": {
         "@typescript-eslint/eslint-plugin": "5.59.6",
         "@typescript-eslint/parser": "5.59.6",
@@ -259,6 +263,19 @@
         "node": ">= 8"
       }
     },
+    "node_modules/@observablehq/plot": {
+      "version": "0.6.6",
+      "resolved": "https://registry.npmjs.org/@observablehq/plot/-/plot-0.6.6.tgz",
+      "integrity": "sha512-OmWn3ZfBwXxwuNUBLE/DEh0aDAo6KVx55MPvwzl4X52W2KGw0Loz3zier3i8spBI5iMCOqY1DnE+hl1mRaBaBA==",
+      "dependencies": {
+        "d3": "^7.8.0",
+        "interval-tree-1d": "^1.0.0",
+        "isoformat": "^0.2.0"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/@types/json-schema": {
       "version": "7.0.11",
       "resolved": "https://registry.npmjs.org/@types/json-schema/-/json-schema-7.0.11.tgz",
@@ -593,6 +610,11 @@
       "integrity": "sha512-1ugUSr8BHXRnK23KfuYS+gVMC3LB8QGH9W1iGtDPsNWoQbgtXSExkBu2aDR4epiGWZOjZsj6lDl/N/AqqTC3UA==",
       "dev": true
     },
+    "node_modules/binary-search-bounds": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/binary-search-bounds/-/binary-search-bounds-2.0.5.tgz",
+      "integrity": "sha512-H0ea4Fd3lS1+sTEB2TgcLoK21lLhwEJzlQv3IN47pJS976Gx4zoWe0ak3q+uYh60ppQxg9F16Ri4tS1sfD4+jA=="
+    },
     "node_modules/brace-expansion": {
       "version": "1.1.11",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
@@ -704,6 +726,14 @@
       "integrity": "sha512-jeC1axXpnb0/2nn/Y1LPuLdgXBLH7aDcHu4KEKfqw3CUhX7ZpfBSlPKyqXE6btIgEzfWtrX3/tyBCaCvXvMkOw==",
       "dev": true
     },
+    "node_modules/commander": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-7.2.0.tgz",
+      "integrity": "sha512-QrWXB+ZQSVPmIWIhtEO9H+gwHaMGYiF5ChvoJ+K9ZGHG/sVsa6yiesAD1GC/x46sET00Xlwo1u49RVVVzvcSkw==",
+      "engines": {
+        "node": ">= 10"
+      }
+    },
     "node_modules/concat-map": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
@@ -791,6 +821,376 @@
         "node": ">=4"
       }
     },
+    "node_modules/d3": {
+      "version": "7.8.4",
+      "resolved": "https://registry.npmjs.org/d3/-/d3-7.8.4.tgz",
+      "integrity": "sha512-q2WHStdhiBtD8DMmhDPyJmXUxr6VWRngKyiJ5EfXMxPw+tqT6BhNjhJZ4w3BHsNm3QoVfZLY8Orq/qPFczwKRA==",
+      "dependencies": {
+        "d3-array": "3",
+        "d3-axis": "3",
+        "d3-brush": "3",
+        "d3-chord": "3",
+        "d3-color": "3",
+        "d3-contour": "4",
+        "d3-delaunay": "6",
+        "d3-dispatch": "3",
+        "d3-drag": "3",
+        "d3-dsv": "3",
+        "d3-ease": "3",
+        "d3-fetch": "3",
+        "d3-force": "3",
+        "d3-format": "3",
+        "d3-geo": "3",
+        "d3-hierarchy": "3",
+        "d3-interpolate": "3",
+        "d3-path": "3",
+        "d3-polygon": "3",
+        "d3-quadtree": "3",
+        "d3-random": "3",
+        "d3-scale": "4",
+        "d3-scale-chromatic": "3",
+        "d3-selection": "3",
+        "d3-shape": "3",
+        "d3-time": "3",
+        "d3-time-format": "4",
+        "d3-timer": "3",
+        "d3-transition": "3",
+        "d3-zoom": "3"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-array": {
+      "version": "3.2.3",
+      "resolved": "https://registry.npmjs.org/d3-array/-/d3-array-3.2.3.tgz",
+      "integrity": "sha512-JRHwbQQ84XuAESWhvIPaUV4/1UYTBOLiOPGWqgFDHZS1D5QN9c57FbH3QpEnQMYiOXNzKUQyGTZf+EVO7RT5TQ==",
+      "dependencies": {
+        "internmap": "1 - 2"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-axis": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/d3-axis/-/d3-axis-3.0.0.tgz",
+      "integrity": "sha512-IH5tgjV4jE/GhHkRV0HiVYPDtvfjHQlQfJHs0usq7M30XcSBvOotpmH1IgkcXsO/5gEQZD43B//fc7SRT5S+xw==",
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-brush": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/d3-brush/-/d3-brush-3.0.0.tgz",
+      "integrity": "sha512-ALnjWlVYkXsVIGlOsuWH1+3udkYFI48Ljihfnh8FZPF2QS9o+PzGLBslO0PjzVoHLZ2KCVgAM8NVkXPJB2aNnQ==",
+      "dependencies": {
+        "d3-dispatch": "1 - 3",
+        "d3-drag": "2 - 3",
+        "d3-interpolate": "1 - 3",
+        "d3-selection": "3",
+        "d3-transition": "3"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-chord": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/d3-chord/-/d3-chord-3.0.1.tgz",
+      "integrity": "sha512-VE5S6TNa+j8msksl7HwjxMHDM2yNK3XCkusIlpX5kwauBfXuyLAtNg9jCp/iHH61tgI4sb6R/EIMWCqEIdjT/g==",
+      "dependencies": {
+        "d3-path": "1 - 3"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-color": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/d3-color/-/d3-color-3.1.0.tgz",
+      "integrity": "sha512-zg/chbXyeBtMQ1LbD/WSoW2DpC3I0mpmPdW+ynRTj/x2DAWYrIY7qeZIHidozwV24m4iavr15lNwIwLxRmOxhA==",
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-contour": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/d3-contour/-/d3-contour-4.0.2.tgz",
+      "integrity": "sha512-4EzFTRIikzs47RGmdxbeUvLWtGedDUNkTcmzoeyg4sP/dvCexO47AaQL7VKy/gul85TOxw+IBgA8US2xwbToNA==",
+      "dependencies": {
+        "d3-array": "^3.2.0"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-delaunay": {
+      "version": "6.0.4",
+      "resolved": "https://registry.npmjs.org/d3-delaunay/-/d3-delaunay-6.0.4.tgz",
+      "integrity": "sha512-mdjtIZ1XLAM8bm/hx3WwjfHt6Sggek7qH043O8KEjDXN40xi3vx/6pYSVTwLjEgiXQTbvaouWKynLBiUZ6SK6A==",
+      "dependencies": {
+        "delaunator": "5"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-dispatch": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/d3-dispatch/-/d3-dispatch-3.0.1.tgz",
+      "integrity": "sha512-rzUyPU/S7rwUflMyLc1ETDeBj0NRuHKKAcvukozwhshr6g6c5d8zh4c2gQjY2bZ0dXeGLWc1PF174P2tVvKhfg==",
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-drag": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/d3-drag/-/d3-drag-3.0.0.tgz",
+      "integrity": "sha512-pWbUJLdETVA8lQNJecMxoXfH6x+mO2UQo8rSmZ+QqxcbyA3hfeprFgIT//HW2nlHChWeIIMwS2Fq+gEARkhTkg==",
+      "dependencies": {
+        "d3-dispatch": "1 - 3",
+        "d3-selection": "3"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-dsv": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/d3-dsv/-/d3-dsv-3.0.1.tgz",
+      "integrity": "sha512-UG6OvdI5afDIFP9w4G0mNq50dSOsXHJaRE8arAS5o9ApWnIElp8GZw1Dun8vP8OyHOZ/QJUKUJwxiiCCnUwm+Q==",
+      "dependencies": {
+        "commander": "7",
+        "iconv-lite": "0.6",
+        "rw": "1"
+      },
+      "bin": {
+        "csv2json": "bin/dsv2json.js",
+        "csv2tsv": "bin/dsv2dsv.js",
+        "dsv2dsv": "bin/dsv2dsv.js",
+        "dsv2json": "bin/dsv2json.js",
+        "json2csv": "bin/json2dsv.js",
+        "json2dsv": "bin/json2dsv.js",
+        "json2tsv": "bin/json2dsv.js",
+        "tsv2csv": "bin/dsv2dsv.js",
+        "tsv2json": "bin/dsv2json.js"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-ease": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/d3-ease/-/d3-ease-3.0.1.tgz",
+      "integrity": "sha512-wR/XK3D3XcLIZwpbvQwQ5fK+8Ykds1ip7A2Txe0yxncXSdq1L9skcG7blcedkOX+ZcgxGAmLX1FrRGbADwzi0w==",
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-fetch": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/d3-fetch/-/d3-fetch-3.0.1.tgz",
+      "integrity": "sha512-kpkQIM20n3oLVBKGg6oHrUchHM3xODkTzjMoj7aWQFq5QEM+R6E4WkzT5+tojDY7yjez8KgCBRoj4aEr99Fdqw==",
+      "dependencies": {
+        "d3-dsv": "1 - 3"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-force": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/d3-force/-/d3-force-3.0.0.tgz",
+      "integrity": "sha512-zxV/SsA+U4yte8051P4ECydjD/S+qeYtnaIyAs9tgHCqfguma/aAQDjo85A9Z6EKhBirHRJHXIgJUlffT4wdLg==",
+      "dependencies": {
+        "d3-dispatch": "1 - 3",
+        "d3-quadtree": "1 - 3",
+        "d3-timer": "1 - 3"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-format": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/d3-format/-/d3-format-3.1.0.tgz",
+      "integrity": "sha512-YyUI6AEuY/Wpt8KWLgZHsIU86atmikuoOmCfommt0LYHiQSPjvX2AcFc38PX0CBpr2RCyZhjex+NS/LPOv6YqA==",
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-geo": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/d3-geo/-/d3-geo-3.1.0.tgz",
+      "integrity": "sha512-JEo5HxXDdDYXCaWdwLRt79y7giK8SbhZJbFWXqbRTolCHFI5jRqteLzCsq51NKbUoX0PjBVSohxrx+NoOUujYA==",
+      "dependencies": {
+        "d3-array": "2.5.0 - 3"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-hierarchy": {
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/d3-hierarchy/-/d3-hierarchy-3.1.2.tgz",
+      "integrity": "sha512-FX/9frcub54beBdugHjDCdikxThEqjnR93Qt7PvQTOHxyiNCAlvMrHhclk3cD5VeAaq9fxmfRp+CnWw9rEMBuA==",
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-interpolate": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/d3-interpolate/-/d3-interpolate-3.0.1.tgz",
+      "integrity": "sha512-3bYs1rOD33uo8aqJfKP3JWPAibgw8Zm2+L9vBKEHJ2Rg+viTR7o5Mmv5mZcieN+FRYaAOWX5SJATX6k1PWz72g==",
+      "dependencies": {
+        "d3-color": "1 - 3"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-path": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/d3-path/-/d3-path-3.1.0.tgz",
+      "integrity": "sha512-p3KP5HCf/bvjBSSKuXid6Zqijx7wIfNW+J/maPs+iwR35at5JCbLUT0LzF1cnjbCHWhqzQTIN2Jpe8pRebIEFQ==",
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-polygon": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/d3-polygon/-/d3-polygon-3.0.1.tgz",
+      "integrity": "sha512-3vbA7vXYwfe1SYhED++fPUQlWSYTTGmFmQiany/gdbiWgU/iEyQzyymwL9SkJjFFuCS4902BSzewVGsHHmHtXg==",
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-quadtree": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/d3-quadtree/-/d3-quadtree-3.0.1.tgz",
+      "integrity": "sha512-04xDrxQTDTCFwP5H6hRhsRcb9xxv2RzkcsygFzmkSIOJy3PeRJP7sNk3VRIbKXcog561P9oU0/rVH6vDROAgUw==",
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-random": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/d3-random/-/d3-random-3.0.1.tgz",
+      "integrity": "sha512-FXMe9GfxTxqd5D6jFsQ+DJ8BJS4E/fT5mqqdjovykEB2oFbTMDVdg1MGFxfQW+FBOGoB++k8swBrgwSHT1cUXQ==",
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-scale": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/d3-scale/-/d3-scale-4.0.2.tgz",
+      "integrity": "sha512-GZW464g1SH7ag3Y7hXjf8RoUuAFIqklOAq3MRl4OaWabTFJY9PN/E1YklhXLh+OQ3fM9yS2nOkCoS+WLZ6kvxQ==",
+      "dependencies": {
+        "d3-array": "2.10.0 - 3",
+        "d3-format": "1 - 3",
+        "d3-interpolate": "1.2.0 - 3",
+        "d3-time": "2.1.1 - 3",
+        "d3-time-format": "2 - 4"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-scale-chromatic": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/d3-scale-chromatic/-/d3-scale-chromatic-3.0.0.tgz",
+      "integrity": "sha512-Lx9thtxAKrO2Pq6OO2Ua474opeziKr279P/TKZsMAhYyNDD3EnCffdbgeSYN5O7m2ByQsxtuP2CSDczNUIZ22g==",
+      "dependencies": {
+        "d3-color": "1 - 3",
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+      "dependencies": {
+        "d3-time": "1 - 3"
+      },
+      "engines": {
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+    "node_modules/d3-timer": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/d3-timer/-/d3-timer-3.0.1.tgz",
+      "integrity": "sha512-ndfJ/JxxMd3nw31uyKoY2naivF+r29V+Lc0svZxe1JvvIRmi8hUsrMvdOwgS1o6uBHmiz91geQ0ylPP0aj1VUA==",
+      "engines": {
+        "node": ">=12"
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+    "node_modules/d3-transition": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/d3-transition/-/d3-transition-3.0.1.tgz",
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+      "dependencies": {
+        "d3-color": "1 - 3",
+        "d3-dispatch": "1 - 3",
+        "d3-ease": "1 - 3",
+        "d3-interpolate": "1 - 3",
+        "d3-timer": "1 - 3"
+      },
+      "engines": {
+        "node": ">=12"
+      },
+      "peerDependencies": {
+        "d3-selection": "2 - 3"
+      }
+    },
+    "node_modules/d3-zoom": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/d3-zoom/-/d3-zoom-3.0.0.tgz",
+      "integrity": "sha512-b8AmV3kfQaqWAuacbPuNbL6vahnOJflOhexLzMMNLga62+/nh0JzvJ0aO/5a5MVgUFGS7Hu1P9P03o3fJkDCyw==",
+      "dependencies": {
+        "d3-dispatch": "1 - 3",
+        "d3-drag": "2 - 3",
+        "d3-interpolate": "1 - 3",
+        "d3-selection": "2 - 3",
+        "d3-transition": "2 - 3"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
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@@ -864,6 +1264,14 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/delaunator": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/delaunator/-/delaunator-5.0.0.tgz",
+      "integrity": "sha512-AyLvtyJdbv/U1GkiS6gUUzclRoAY4Gs75qkMygJJhU75LW4DNuSF2RMzpxs9jw9Oz1BobHjTdkG3zdP55VxAqw==",
+      "dependencies": {
+        "robust-predicates": "^3.0.0"
+      }
+    },
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       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/dir-glob/-/dir-glob-3.0.1.tgz",
@@ -1815,6 +2223,17 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/iconv-lite": {
+      "version": "0.6.3",
+      "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.6.3.tgz",
+      "integrity": "sha512-4fCk79wshMdzMp2rH06qWrJE4iolqLhCUH+OiuIgU++RB0+94NlDL81atO7GX55uUKueo0txHNtvEyI6D7WdMw==",
+      "dependencies": {
+        "safer-buffer": ">= 2.1.2 < 3.0.0"
+      },
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
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       "resolved": "https://registry.npmjs.org/ignore/-/ignore-5.2.4.tgz",
@@ -1912,6 +2331,22 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/internmap": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/internmap/-/internmap-2.0.3.tgz",
+      "integrity": "sha512-5Hh7Y1wQbvY5ooGgPbDaL5iYLAPzMTUrjMulskHLH6wnv/A+1q5rgEaiuqEjB+oxGXIVZs1FF+R/KPN3ZSQYYg==",
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/interval-tree-1d": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/interval-tree-1d/-/interval-tree-1d-1.0.4.tgz",
+      "integrity": "sha512-wY8QJH+6wNI0uh4pDQzMvl+478Qh7Rl4qLmqiluxALlNvl+I+o5x38Pw3/z7mDPTPS1dQalZJXsmbvxx5gclhQ==",
+      "dependencies": {
+        "binary-search-bounds": "^2.0.0"
+      }
+    },
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       "version": "3.0.2",
       "resolved": "https://registry.npmjs.org/is-array-buffer/-/is-array-buffer-3.0.2.tgz",
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       "dev": true
     },
+    "node_modules/isoformat": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/isoformat/-/isoformat-0.2.1.tgz",
+      "integrity": "sha512-tFLRAygk9NqrRPhJSnNGh7g7oaVWDwR0wKh/GM2LgmPa50Eg4UfyaCO4I8k6EqJHl1/uh2RAD6g06n5ygEnrjQ=="
+    },
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       "version": "4.4.0",
       "resolved": "https://registry.npmjs.org/js-sdsl/-/js-sdsl-4.4.0.tgz",
@@ -3160,6 +3600,11 @@
         "url": "https://github.com/sponsors/isaacs"
       }
     },
+    "node_modules/robust-predicates": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/robust-predicates/-/robust-predicates-3.0.1.tgz",
+      "integrity": "sha512-ndEIpszUHiG4HtDsQLeIuMvRsDnn8c8rYStabochtUeCvfuvNptb5TUbVD68LRAILPX7p9nqQGh4xJgn3EHS/g=="
+    },
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       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/run-parallel/-/run-parallel-1.2.0.tgz",
@@ -3183,6 +3628,11 @@
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       }
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+      "resolved": "https://registry.npmjs.org/rw/-/rw-1.3.3.tgz",
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+    },
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       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/safe-regex-test/-/safe-regex-test-1.0.0.tgz",
@@ -3197,6 +3647,11 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/safer-buffer": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
+      "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg=="
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diff --git a/godev/package.json b/godev/package.json
index 5b90b39..db9dbd4 100644
--- a/godev/package.json
+++ b/godev/package.json
@@ -15,5 +15,9 @@
     "stylelint": "15.6.2",
     "stylelint-config-standard": "33.0.0",
     "typescript": "5.0.4"
+  },
+  "dependencies": {
+    "@observablehq/plot": "0.6.6",
+    "d3": "7.8.4"
   }
 }
diff --git a/godev/third_party/@observablehq/plot@0.6.6/LICENSE b/godev/third_party/@observablehq/plot@0.6.6/LICENSE
new file mode 100644
index 0000000..7ad9b96
--- /dev/null
+++ b/godev/third_party/@observablehq/plot@0.6.6/LICENSE
@@ -0,0 +1,13 @@
+Copyright 2020-2023 Observable, Inc.
+
+Permission to use, copy, modify, and/or distribute this software for any purpose
+with or without fee is hereby granted, provided that the above copyright notice
+and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+THIS SOFTWARE.
diff --git a/godev/third_party/@observablehq/plot@0.6.6/dist/plot.umd.min.js b/godev/third_party/@observablehq/plot@0.6.6/dist/plot.umd.min.js
new file mode 100644
index 0000000..814c858
--- /dev/null
+++ b/godev/third_party/@observablehq/plot@0.6.6/dist/plot.umd.min.js
@@ -0,0 +1,2 @@
+// @observablehq/plot v0.6.6 Copyright 2020-2023 Observable, Inc.
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_r{constructor(t,e={}){let{x:n,y:r,r:o,width:i,height:a,rotate:s,src:c,preserveAspectRatio:u,crossOrigin:f,frameAnchor:h,imageRendering:d}=e;null==o&&(o=void 0),void 0===o&&void 0===i&&void 0===a?i=a=16:void 0===i&&void 0!==a?i=a:void 0===a&&void 0!==i&&(a=i);const[p,m]="string"==typeof(g=c)&&(function(t){return/^\.*\//.test(t)}(g)||function(t){return/^(blob|data|file|http|https):/i.test(t)}(g))?[void 0,g]:[g,void 0];var g;const[y,v]=W(o),[x,w]=W(i,void 0!==v?2*v:void 0),[b,k]=W(a,void 0!==v?2*v:void 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diff --git a/godev/third_party/@observablehq/plot@0.6.6/package.json b/godev/third_party/@observablehq/plot@0.6.6/package.json
new file mode 100644
index 0000000..537511a
--- /dev/null
+++ b/godev/third_party/@observablehq/plot@0.6.6/package.json
@@ -0,0 +1,86 @@
+{
+  "name": "@observablehq/plot",
+  "description": "A JavaScript library for exploratory data visualization.",
+  "version": "0.6.6",
+  "author": {
+    "name": "Observable, Inc.",
+    "url": "https://observablehq.com"
+  },
+  "license": "ISC",
+  "type": "module",
+  "main": "src/index.js",
+  "module": "src/index.js",
+  "jsdelivr": "dist/plot.umd.min.js",
+  "unpkg": "dist/plot.umd.min.js",
+  "exports": {
+    "umd": "./dist/plot.umd.min.js",
+    "default": "./src/index.js"
+  },
+  "types": "src/index.d.ts",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/observablehq/plot.git"
+  },
+  "files": [
+    "dist/**/*.js",
+    "src/**/*.d.ts",
+    "src/**/*.js"
+  ],
+  "scripts": {
+    "test": "yarn test:mocha && yarn test:tsc && yarn test:lint && yarn test:prettier",
+    "test:mocha": "mkdir -p test/output && mocha 'test/**/*-test.*' 'test/plot.js'",
+    "test:lint": "eslint src test",
+    "test:prettier": "prettier --check src test",
+    "test:tsc": "tsc",
+    "prepublishOnly": "rm -rf dist && rollup -c",
+    "postpublish": "git push && git push --tags",
+    "dev": "vite",
+    "docs:dev": "vitepress dev docs",
+    "docs:build": "vitepress build docs",
+    "docs:preview": "vitepress preview docs"
+  },
+  "_moduleAliases": {
+    "@observablehq/plot": "./src/index.js"
+  },
+  "sideEffects": [
+    "./src/plot.js"
+  ],
+  "devDependencies": {
+    "@esbuild-kit/core-utils": "^3.1.0",
+    "@rollup/plugin-commonjs": "^24.0.1",
+    "@rollup/plugin-json": "^6.0.0",
+    "@rollup/plugin-node-resolve": "^15.0.1",
+    "@rollup/plugin-terser": "^0.4.0",
+    "@types/d3": "^7.4.0",
+    "@typescript-eslint/eslint-plugin": "^5.54.1",
+    "@typescript-eslint/parser": "^5.54.1",
+    "canvas": "^2.0.0",
+    "d3-geo-projection": "^4.0.0",
+    "eslint": "^8.16.0",
+    "eslint-config-prettier": "^8.5.0",
+    "get-tsconfig": "^4.1.0",
+    "htl": "^0.3.0",
+    "js-beautify": "1",
+    "jsdom": "^21.0.0",
+    "markdown-it-container": "^3.0.0",
+    "mocha": "^10.0.0",
+    "module-alias": "^2.0.0",
+    "prettier": "^2.7.1",
+    "rollup": "^3.7.0",
+    "topojson-client": "^3.1.0",
+    "typescript": "^5.0.2",
+    "vite": "^4.0.0",
+    "vitepress": "^1.0.0-alpha.72"
+  },
+  "dependencies": {
+    "d3": "^7.8.0",
+    "interval-tree-1d": "^1.0.0",
+    "isoformat": "^0.2.0"
+  },
+  "engines": {
+    "node": ">=12"
+  },
+  "publishConfig": {
+    "access": "public"
+  }
+}
diff --git a/godev/third_party/d3@7.8.4/LICENSE b/godev/third_party/d3@7.8.4/LICENSE
new file mode 100644
index 0000000..3594fff
--- /dev/null
+++ b/godev/third_party/d3@7.8.4/LICENSE
@@ -0,0 +1,13 @@
+Copyright 2010-2023 Mike Bostock
+
+Permission to use, copy, modify, and/or distribute this software for any purpose
+with or without fee is hereby granted, provided that the above copyright notice
+and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+THIS SOFTWARE.
diff --git a/godev/third_party/d3@7.8.4/dist/d3.min.js b/godev/third_party/d3@7.8.4/dist/d3.min.js
new file mode 100644
index 0000000..2c10135
--- /dev/null
+++ b/godev/third_party/d3@7.8.4/dist/d3.min.js
@@ -0,0 +1,2 @@
+// https://d3js.org v7.8.4 Copyright 2010-2023 Mike Bostock
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arguments.length?(r=t?u:ru,i):r===u},i}function au(t){return isFinite(t)?t:NaN}function uu(t,n){return null!=t&&+t>=n}function cu(t){return null==t||isNaN(t=+t)?-1/0:t}function fu(t,n,e,r){const i=r-n,o=e-n,a=isFinite(i)||isFinite(o)?i/o:Math.sign(i)/Math.sign(o);return isNaN(a)?t:t+a-.5}function su(t){return t[0]}function lu(t){return t[1]}function hu(){return 1}const du=134217729,pu=33306690738754706e-32;function gu(t,n,e,r,i){let o,a,u,c,f=n[0],s=r[0],l=0,h=0;s>f==s>-f?(o=f,f=n[++l]):(o=s,s=r[++h]);let d=0;if(l<t&&h<e)for(s>f==s>-f?(a=f+o,u=o-(a-f),f=n[++l]):(a=s+o,u=o-(a-s),s=r[++h]),o=a,0!==u&&(i[d++]=u);l<t&&h<e;)s>f==s>-f?(a=o+f,c=a-o,u=o-(a-c)+(f-c),f=n[++l]):(a=o+s,c=a-o,u=o-(a-c)+(s-c),s=r[++h]),o=a,0!==u&&(i[d++]=u);for(;l<t;)a=o+f,c=a-o,u=o-(a-c)+(f-c),f=n[++l],o=a,0!==u&&(i[d++]=u);for(;h<e;)a=o+s,c=a-o,u=o-(a-c)+(s-c),s=r[++h],o=a,0!==u&&(i[d++]=u);return 0===o&&0!==d||(i[d++]=o),d}function yu(t){return new Float64Array(t)}const vu=22204460492503146e-32,_u=11093356479670487e-47,bu=yu(4),mu=yu(8),xu=yu(12),wu=yu(16),Mu=yu(4);function Tu(t,n,e,r,i,o){const a=(n-o)*(e-i),u=(t-i)*(r-o),c=a-u;if(0===a||0===u||a>0!=u>0)return c;const f=Math.abs(a+u);return Math.abs(c)>=33306690738754716e-32*f?c:-function(t,n,e,r,i,o,a){let u,c,f,s,l,h,d,p,g,y,v,_,b,m,x,w,M,T;const A=t-i,S=e-i,E=n-o,N=r-o;m=A*N,h=du*A,d=h-(h-A),p=A-d,h=du*N,g=h-(h-N),y=N-g,x=p*y-(m-d*g-p*g-d*y),w=E*S,h=du*E,d=h-(h-E),p=E-d,h=du*S,g=h-(h-S),y=S-g,M=p*y-(w-d*g-p*g-d*y),v=x-M,l=x-v,bu[0]=x-(v+l)+(l-M),_=m+v,l=_-m,b=m-(_-l)+(v-l),v=b-w,l=b-v,bu[1]=b-(v+l)+(l-w),T=_+v,l=T-_,bu[2]=_-(T-l)+(v-l),bu[3]=T;let k=function(t,n){let e=n[0];for(let r=1;r<t;r++)e+=n[r];return e}(4,bu),C=vu*a;if(k>=C||-k>=C)return k;if(l=t-A,u=t-(A+l)+(l-i),l=e-S,f=e-(S+l)+(l-i),l=n-E,c=n-(E+l)+(l-o),l=r-N,s=r-(N+l)+(l-o),0===u&&0===c&&0===f&&0===s)return k;if(C=_u*a+pu*Math.abs(k),k+=A*s+N*u-(E*f+S*c),k>=C||-k>=C)return k;m=u*N,h=du*u,d=h-(h-u),p=u-d,h=du*N,g=h-(h-N),y=N-g,x=p*y-(m-d*g-p*g-d*y),w=c*S,h=du*c,d=h-(h-c),p=c-d,h=du*S,g=h-(h-S),y=S-g,M=p*y-(w-d*g-p*g-d*y),v=x-M,l=x-v,Mu[0]=x-(v+l)+(l-M),_=m+v,l=_-m,b=m-(_-l)+(v-l),v=b-w,l=b-v,Mu[1]=b-(v+l)+(l-w),T=_+v,l=T-_,Mu[2]=_-(T-l)+(v-l),Mu[3]=T;const P=gu(4,bu,4,Mu,mu);m=A*s,h=du*A,d=h-(h-A),p=A-d,h=du*s,g=h-(h-s),y=s-g,x=p*y-(m-d*g-p*g-d*y),w=E*f,h=du*E,d=h-(h-E),p=E-d,h=du*f,g=h-(h-f),y=f-g,M=p*y-(w-d*g-p*g-d*y),v=x-M,l=x-v,Mu[0]=x-(v+l)+(l-M),_=m+v,l=_-m,b=m-(_-l)+(v-l),v=b-w,l=b-v,Mu[1]=b-(v+l)+(l-w),T=_+v,l=T-_,Mu[2]=_-(T-l)+(v-l),Mu[3]=T;const z=gu(P,mu,4,Mu,xu);m=u*s,h=du*u,d=h-(h-u),p=u-d,h=du*s,g=h-(h-s),y=s-g,x=p*y-(m-d*g-p*g-d*y),w=c*f,h=du*c,d=h-(h-c),p=c-d,h=du*f,g=h-(h-f),y=f-g,M=p*y-(w-d*g-p*g-d*y),v=x-M,l=x-v,Mu[0]=x-(v+l)+(l-M),_=m+v,l=_-m,b=m-(_-l)+(v-l),v=b-w,l=b-v,Mu[1]=b-(v+l)+(l-w),T=_+v,l=T-_,Mu[2]=_-(T-l)+(v-l),Mu[3]=T;const $=gu(z,xu,4,Mu,wu);return wu[$-1]}(t,n,e,r,i,o,f)}const Au=Math.pow(2,-52),Su=new Uint32Array(512);class Eu{static from(t,n=$u,e=Du){const r=t.length,i=new Float64Array(2*r);for(let o=0;o<r;o++){const r=t[o];i[2*o]=n(r),i[2*o+1]=e(r)}return new Eu(i)}constructor(t){const n=t.length>>1;if(n>0&&"number"!=typeof t[0])throw new Error("Expected coords to contain numbers.");this.coords=t;const e=Math.max(2*n-5,0);this._triangles=new Uint32Array(3*e),this._halfedges=new Int32Array(3*e),this._hashSize=Math.ceil(Math.sqrt(n)),this._hullPrev=new Uint32Array(n),this._hullNext=new Uint32Array(n),this._hullTri=new Uint32Array(n),this._hullHash=new Int32Array(this._hashSize).fill(-1),this._ids=new Uint32Array(n),this._dists=new Float64Array(n),this.update()}update(){const{coords:t,_hullPrev:n,_hullNext:e,_hullTri:r,_hullHash:i}=this,o=t.length>>1;let a=1/0,u=1/0,c=-1/0,f=-1/0;for(let n=0;n<o;n++){const e=t[2*n],r=t[2*n+1];e<a&&(a=e),r<u&&(u=r),e>c&&(c=e),r>f&&(f=r),this._ids[n]=n}const s=(a+c)/2,l=(u+f)/2;let h,d,p,g=1/0;for(let n=0;n<o;n++){const 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n=0;n<o;n++)this._dists[n]=Nu(t[2*n],t[2*n+1],M.x,M.y);Pu(this._ids,this._dists,0,o-1),this._hullStart=h;let T=3;e[h]=n[p]=d,e[d]=n[h]=p,e[p]=n[d]=h,r[h]=0,r[d]=1,r[p]=2,i.fill(-1),i[this._hashKey(y,v)]=h,i[this._hashKey(_,b)]=d,i[this._hashKey(x,w)]=p,this.trianglesLen=0,this._addTriangle(h,d,p,-1,-1,-1);for(let o,a,u=0;u<this._ids.length;u++){const c=this._ids[u],f=t[2*c],s=t[2*c+1];if(u>0&&Math.abs(f-o)<=Au&&Math.abs(s-a)<=Au)continue;if(o=f,a=s,c===h||c===d||c===p)continue;let l=0;for(let t=0,n=this._hashKey(f,s);t<this._hashSize&&(l=i[(n+t)%this._hashSize],-1===l||l===e[l]);t++);l=n[l];let g,y=l;for(;g=e[y],Tu(f,s,t[2*y],t[2*y+1],t[2*g],t[2*g+1])>=0;)if(y=g,y===l){y=-1;break}if(-1===y)continue;let v=this._addTriangle(y,c,e[y],-1,-1,r[y]);r[c]=this._legalize(v+2),r[y]=v,T++;let 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c=a-a%3,f=u+(t+1)%3,s=c+(a+2)%3,l=n[o],h=n[t],d=n[f],p=n[s];if(ku(r[2*l],r[2*l+1],r[2*h],r[2*h+1],r[2*d],r[2*d+1],r[2*p],r[2*p+1])){n[t]=p,n[a]=l;const r=e[s];if(-1===r){let n=this._hullStart;do{if(this._hullTri[n]===s){this._hullTri[n]=t;break}n=this._hullPrev[n]}while(n!==this._hullStart)}this._link(t,r),this._link(a,e[o]),this._link(o,s);const u=c+(a+1)%3;i<Su.length&&(Su[i++]=u)}else{if(0===i)break;t=Su[--i]}}return o}_link(t,n){this._halfedges[t]=n,-1!==n&&(this._halfedges[n]=t)}_addTriangle(t,n,e,r,i,o){const a=this.trianglesLen;return this._triangles[a]=t,this._triangles[a+1]=n,this._triangles[a+2]=e,this._link(a,r),this._link(a+1,i),this._link(a+2,o),this.trianglesLen+=3,a}}function Nu(t,n,e,r){const i=t-e,o=n-r;return i*i+o*o}function ku(t,n,e,r,i,o,a,u){const c=t-a,f=n-u,s=e-a,l=r-u,h=i-a,d=o-u,p=s*s+l*l,g=h*h+d*d;return c*(l*g-p*d)-f*(s*g-p*h)+(c*c+f*f)*(s*d-l*h)<0}function Cu(t,n,e,r,i,o){const a=e-t,u=r-n,c=i-t,f=o-n,s=a*a+u*u,l=c*c+f*f,h=.5/(a*f-u*c),d=(f*s-u*l)*h,p=(a*l-c*s)*h;return d*d+p*p}function Pu(t,n,e,r){if(r-e<=20)for(let i=e+1;i<=r;i++){const r=t[i],o=n[r];let a=i-1;for(;a>=e&&n[t[a]]>o;)t[a+1]=t[a--];t[a+1]=r}else{let i=e+1,o=r;zu(t,e+r>>1,i),n[t[e]]>n[t[r]]&&zu(t,e,r),n[t[i]]>n[t[r]]&&zu(t,i,r),n[t[e]]>n[t[i]]&&zu(t,e,i);const a=t[i],u=n[a];for(;;){do{i++}while(n[t[i]]<u);do{o--}while(n[t[o]]>u);if(o<i)break;zu(t,i,o)}t[e+1]=t[o],t[o]=a,r-i+1>=o-e?(Pu(t,n,i,r),Pu(t,n,e,o-1)):(Pu(t,n,e,o-1),Pu(t,n,i,r))}}function zu(t,n,e){const r=t[n];t[n]=t[e],t[e]=r}function $u(t){return t[0]}function Du(t){return t[1]}const Ru=1e-6;class Fu{constructor(){this._x0=this._y0=this._x1=this._y1=null,this._=""}moveTo(t,n){this._+=`M${this._x0=this._x1=+t},${this._y0=this._y1=+n}`}closePath(){null!==this._x1&&(this._x1=this._x0,this._y1=this._y0,this._+="Z")}lineTo(t,n){this._+=`L${this._x1=+t},${this._y1=+n}`}arc(t,n,e){const r=(t=+t)+(e=+e),i=n=+n;if(e<0)throw new Error("negative 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3:Rx(this,this._x1,this._y1);case 2:this._context.lineTo(this._x1,this._y1)}(this._line||0!==this._line&&1===this._point)&&this._context.closePath(),this._line=1-this._line},point:function(t,n){switch(t=+t,n=+n,this._point){case 0:this._point=1,this._line?this._context.lineTo(t,n):this._context.moveTo(t,n);break;case 1:this._point=2;break;case 2:this._point=3,this._context.lineTo((5*this._x0+this._x1)/6,(5*this._y0+this._y1)/6);default:Rx(this,t,n)}this._x0=this._x1,this._x1=t,this._y0=this._y1,this._y1=n}},qx.prototype={areaStart:Dx,areaEnd:Dx,lineStart:function(){this._x0=this._x1=this._x2=this._x3=this._x4=this._y0=this._y1=this._y2=this._y3=this._y4=NaN,this._point=0},lineEnd:function(){switch(this._point){case 1:this._context.moveTo(this._x2,this._y2),this._context.closePath();break;case 2:this._context.moveTo((this._x2+2*this._x3)/3,(this._y2+2*this._y3)/3),this._context.lineTo((this._x3+2*this._x2)/3,(this._y3+2*this._y2)/3),this._context.closePath();break;case 3:this.point(this._x2,this._y2),this.point(this._x3,this._y3),this.point(this._x4,this._y4)}},point:function(t,n){switch(t=+t,n=+n,this._point){case 0:this._point=1,this._x2=t,this._y2=n;break;case 1:this._point=2,this._x3=t,this._y3=n;break;case 2:this._point=3,this._x4=t,this._y4=n,this._context.moveTo((this._x0+4*this._x1+t)/6,(this._y0+4*this._y1+n)/6);break;default:Rx(this,t,n)}this._x0=this._x1,this._x1=t,this._y0=this._y1,this._y1=n}},Ux.prototype={areaStart:function(){this._line=0},areaEnd:function(){this._line=NaN},lineStart:function(){this._x0=this._x1=this._y0=this._y1=NaN,this._point=0},lineEnd:function(){(this._line||0!==this._line&&3===this._point)&&this._context.closePath(),this._line=1-this._line},point:function(t,n){switch(t=+t,n=+n,this._point){case 0:this._point=1;break;case 1:this._point=2;break;case 2:this._point=3;var e=(this._x0+4*this._x1+t)/6,r=(this._y0+4*this._y1+n)/6;this._line?this._context.lineTo(e,r):this._context.moveTo(e,r);break;case 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diff --git a/godev/third_party/d3@7.8.4/package.json b/godev/third_party/d3@7.8.4/package.json
new file mode 100644
index 0000000..66cfd45
--- /dev/null
+++ b/godev/third_party/d3@7.8.4/package.json
@@ -0,0 +1,84 @@
+{
+  "name": "d3",
+  "version": "7.8.4",
+  "description": "Data-Driven Documents",
+  "homepage": "https://d3js.org",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/d3/d3.git"
+  },
+  "keywords": [
+    "d3",
+    "dom",
+    "visualization",
+    "svg",
+    "animation",
+    "canvas"
+  ],
+  "license": "ISC",
+  "author": {
+    "name": "Mike Bostock",
+    "url": "https://bost.ocks.org/mike"
+  },
+  "type": "module",
+  "files": [
+    "dist/**/*.js",
+    "src/**/*.js"
+  ],
+  "module": "src/index.js",
+  "main": "src/index.js",
+  "jsdelivr": "dist/d3.min.js",
+  "unpkg": "dist/d3.min.js",
+  "exports": {
+    "umd": "./dist/d3.min.js",
+    "default": "./src/index.js"
+  },
+  "dependencies": {
+    "d3-array": "3",
+    "d3-axis": "3",
+    "d3-brush": "3",
+    "d3-chord": "3",
+    "d3-color": "3",
+    "d3-contour": "4",
+    "d3-delaunay": "6",
+    "d3-dispatch": "3",
+    "d3-drag": "3",
+    "d3-dsv": "3",
+    "d3-ease": "3",
+    "d3-fetch": "3",
+    "d3-force": "3",
+    "d3-format": "3",
+    "d3-geo": "3",
+    "d3-hierarchy": "3",
+    "d3-interpolate": "3",
+    "d3-path": "3",
+    "d3-polygon": "3",
+    "d3-quadtree": "3",
+    "d3-random": "3",
+    "d3-scale": "4",
+    "d3-scale-chromatic": "3",
+    "d3-selection": "3",
+    "d3-shape": "3",
+    "d3-time": "3",
+    "d3-time-format": "4",
+    "d3-timer": "3",
+    "d3-transition": "3",
+    "d3-zoom": "3"
+  },
+  "devDependencies": {
+    "@rollup/plugin-json": "6",
+    "@rollup/plugin-node-resolve": "15",
+    "eslint": "8",
+    "mocha": "10",
+    "rollup": "3",
+    "rollup-plugin-terser": "7"
+  },
+  "scripts": {
+    "test": "mocha 'test/**/*-test.js' && eslint src test",
+    "prepublishOnly": "rm -rf dist && rollup -c",
+    "postpublish": "git push && git push --tags && cd ../d3.github.com && git pull && cp ../d3/dist/d3.js d3.v${npm_package_version%%.*}.js && cp ../d3/dist/d3.min.js d3.v${npm_package_version%%.*}.min.js && git add d3.v${npm_package_version%%.*}.js d3.v${npm_package_version%%.*}.min.js && git commit -m \"d3 ${npm_package_version}\" && git push && cd -"
+  },
+  "engines": {
+    "node": ">=12"
+  }
+}