diff --git a/_content/doc/next.md b/_content/doc/next.md
new file mode 100644
index 0000000..2eb58d9
--- /dev/null
+++ b/_content/doc/next.md
@@ -0,0 +1,6 @@
+---
+title: Next Release Notes Draft
+template: true
+---
+
+{{with docNext}}{{.}}{{else}}No next release note fragments available.{{end}}
diff --git a/cmd/golangorg/server.go b/cmd/golangorg/server.go
index 4f87330..6c42ade 100644
--- a/cmd/golangorg/server.go
+++ b/cmd/golangorg/server.go
@@ -33,6 +33,7 @@
 	"time"
 
 	"cloud.google.com/go/datastore"
+	"golang.org/x/build/relnote"
 	"golang.org/x/build/repos"
 	"golang.org/x/website"
 	"golang.org/x/website/internal/blog"
@@ -49,6 +50,7 @@
 	"golang.org/x/website/internal/tour"
 	"golang.org/x/website/internal/web"
 	"golang.org/x/website/internal/webtest"
+	"rsc.io/markdown"
 )
 
 var (
@@ -277,6 +279,7 @@
 		"rfc3339":         parseRFC3339,
 		"section":         section,
 		"version":         func() string { return runtime.Version() },
+		"docNext":         releaseNotePreview{goroot}.MergedFragments,
 	})
 	docs, err := pkgdoc.NewServer(fsys, site, googleCN)
 	if err != nil {
@@ -290,6 +293,34 @@
 	return site, nil
 }
 
+// releaseNotePreview implements a preview of upcoming release notes.
+type releaseNotePreview struct {
+	goroot fs.FS // goroot provides the doc/next content to use, if any.
+}
+
+// MergedFragments returns Markdown obtained by merging release note fragments
+// found in the doc/next directory in goroot, to preview relnote generate output.
+// An empty string and no error is returned if the doc/next directory doesn't exist.
+func (p releaseNotePreview) MergedFragments() (markdownWithEmbeddedHTML template.HTML, _ error) {
+	next, err := fs.Sub(p.goroot, "doc/next")
+	if err != nil {
+		return "", err
+	}
+	if _, err := fs.Stat(next, "."); os.IsNotExist(err) || errors.Is(err, errNoFileSystem) {
+		// No next release note fragments.
+		return "", nil
+	}
+	doc, err := relnote.Merge(next)
+	if err != nil {
+		return "", fmt.Errorf("relnote.Merge: %v", err)
+	}
+	// Note: It's possible to render doc, a parsed Markdown document with embedded HTML,
+	// into Markdown or HTML. We choose to render to Markdown and let x/website/internal/web
+	// handle the remaining conversion to HTML. This means the rendering is more consistent
+	// with what'll happen when relnote generate output is added as _content/doc/go1.N.md.
+	return template.HTML(markdown.ToMarkdown(doc)), nil
+}
+
 func parseRFC3339(s string) (time.Time, error) {
 	return time.Parse(time.RFC3339, s)
 }
@@ -831,12 +862,14 @@
 	return m.old.Open(name)
 }
 
+var errNoFileSystem = errors.New("no file system")
+
 // Open returns fsys.Open(name) where fsys is the file system passed to the most recent call to Set.
-// If there has been no call to Set, Open returns an error with text “no file system”.
+// If there has been no call to Set, Open returns errNoFileSystem, an error with text “no file system”.
 func (a *atomicFS) Open(name string) (fs.File, error) {
 	fsys, _ := a.v.Load().(*fs.FS)
 	if fsys == nil {
-		return nil, &fs.PathError{Path: name, Op: "open", Err: fmt.Errorf("no file system")}
+		return nil, &fs.PathError{Path: name, Op: "open", Err: errNoFileSystem}
 	}
 	return (*fsys).Open(name)
 }
diff --git a/cmd/golangorg/testdata/web.txt b/cmd/golangorg/testdata/web.txt
index 834a928..da95c42 100644
--- a/cmd/golangorg/testdata/web.txt
+++ b/cmd/golangorg/testdata/web.txt
@@ -458,3 +458,9 @@
 
 GET https://go.dev/CONTRIBUTORS
 redirect == /AUTHORS
+
+GET https://go.dev/doc/next
+body contains <h1>Next Release Notes Draft</h1>
+
+GET https://tip.golang.org/doc/next
+body contains <h1>Next Release Notes Draft</h1>
diff --git a/go.mod b/go.mod
index 118a5e2..14ecfca 100644
--- a/go.mod
+++ b/go.mod
@@ -19,6 +19,7 @@
 	golang.org/x/tools v0.21.0
 	google.golang.org/api v0.136.0
 	gopkg.in/yaml.v3 v3.0.1
+	rsc.io/markdown v0.0.0-20240306144322-0bf8f97ee8ef
 )
 
 require (
diff --git a/go.sum b/go.sum
index 3d19000..35f32bf 100644
--- a/go.sum
+++ b/go.sum
@@ -255,3 +255,5 @@
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+rsc.io/markdown v0.0.0-20240306144322-0bf8f97ee8ef h1:mqLYrXCXYEZOop9/Dbo6RPX11539nwiCNBb1icVPmw8=
+rsc.io/markdown v0.0.0-20240306144322-0bf8f97ee8ef/go.mod h1:8xcPgWmwlZONN1D9bjxtHEjrUtSEa3fakVF8iaewYKQ=