diff --git a/doc/docgen.zig b/doc/docgen.zig
index e2da1fe6cc79..b1e287d58c8e 100644
--- a/doc/docgen.zig
+++ b/doc/docgen.zig
@@ -250,7 +250,7 @@ fn eatToken(tokenizer: *Tokenizer, id: Token.Id) !Token {
     return token;
 }
 
-const HeaderOpen = struct {
+const SectionOpen = struct {
     name: []const u8,
     url: []const u8,
     n: usize,
@@ -295,7 +295,7 @@ const Node = union(enum) {
     Content: []const u8,
     Nav,
     Builtin,
-    HeaderOpen: HeaderOpen,
+    SectionOpen: SectionOpen,
     SeeAlso: []const SeeAlsoItem,
     Code: Code,
     Link: Link,
@@ -316,7 +316,7 @@ fn genToc(allocator: *mem.Allocator, tokenizer: *Tokenizer) !Toc {
     var urls = std.HashMap([]const u8, Token, mem.hash_slice_u8, mem.eql_slice_u8).init(allocator);
     errdefer urls.deinit();
 
-    var header_stack_size: usize = 0;
+    var section_depth: usize = 0;
     var last_action = Action.Open;
 
     var toc_buf = try std.Buffer.initSize(allocator, 0);
@@ -334,8 +334,8 @@ fn genToc(allocator: *mem.Allocator, tokenizer: *Tokenizer) !Toc {
         const token = tokenizer.next();
         switch (token.id) {
             Token.Id.Eof => {
-                if (header_stack_size != 0) {
-                    return parseError(tokenizer, token, "unbalanced headers");
+                if (section_depth != 0) {
+                    return parseError(tokenizer, token, "unbalanced sections");
                 }
                 try toc.write("    </ul>\n");
                 break;
@@ -354,45 +354,48 @@ fn genToc(allocator: *mem.Allocator, tokenizer: *Tokenizer) !Toc {
                 } else if (mem.eql(u8, tag_name, "builtin")) {
                     _ = try eatToken(tokenizer, Token.Id.BracketClose);
                     try nodes.append(Node.Builtin);
-                } else if (mem.eql(u8, tag_name, "header_open")) {
+                } else if (mem.eql(u8, tag_name, "header_open")) { // TODO: Rename to section_open
                     _ = try eatToken(tokenizer, Token.Id.Separator);
                     const content_token = try eatToken(tokenizer, Token.Id.TagContent);
                     const content = tokenizer.buffer[content_token.start..content_token.end];
                     _ = try eatToken(tokenizer, Token.Id.BracketClose);
 
-                    header_stack_size += 1;
+                    section_depth += 1;
 
                     const urlized = try urlize(allocator, content);
                     try nodes.append(Node{
-                        .HeaderOpen = HeaderOpen{
+                        .SectionOpen = SectionOpen{
                             .name = content,
                             .url = urlized,
-                            .n = header_stack_size,
+                            .n = section_depth,
                         },
                     });
                     if (try urls.put(urlized, tag_token)) |other_tag_token| {
-                        parseError(tokenizer, tag_token, "duplicate header url: #{}", urlized) catch {};
+                        parseError(tokenizer, tag_token, "duplicate section url: #{}", urlized) catch {};
                         parseError(tokenizer, other_tag_token, "other tag here") catch {};
                         return error.ParseError;
                     }
                     if (last_action == Action.Open) {
                         try toc.writeByte('\n');
-                        try toc.writeByteNTimes(' ', header_stack_size * 4);
+                        try toc.writeByteNTimes(' ', section_depth * 4);
                         try toc.write("<ul>\n");
                     } else {
                         last_action = Action.Open;
                     }
-                    try toc.writeByteNTimes(' ', 4 + header_stack_size * 4);
+                    try toc.writeByteNTimes(' ', 4 + section_depth * 4);
                     try toc.print("<li><a href=\"#{}\">{}</a>", urlized, content);
-                } else if (mem.eql(u8, tag_name, "header_close")) {
-                    if (header_stack_size == 0) {
-                        return parseError(tokenizer, tag_token, "unbalanced close header");
+                } else if (mem.eql(u8, tag_name, "header_close")) { // TODO: Rename to section_close
+                    if (section_depth == 0) {
+                        return parseError(tokenizer, tag_token, "unbalanced close section");
                     }
-                    header_stack_size -= 1;
+                    section_depth -= 1;
                     _ = try eatToken(tokenizer, Token.Id.BracketClose);
 
+                    try nodes.append(Node{
+                        .Content = "</section>",
+                    });
                     if (last_action == Action.Close) {
-                        try toc.writeByteNTimes(' ', 8 + header_stack_size * 4);
+                        try toc.writeByteNTimes(' ', 8 + section_depth * 4);
                         try toc.write("</ul></li>\n");
                     } else {
                         try toc.write("</li>\n");
@@ -711,8 +714,8 @@ fn genHtml(allocator: *mem.Allocator, tokenizer: *Tokenizer, toc: *Toc, out: var
             Node.Builtin => {
                 try out.print("<pre><code class=\"zig\">{}</code></pre>", builtin_code);
             },
-            Node.HeaderOpen => |info| {
-                try out.print("<h{} id=\"{}\">{}</h{}>\n", info.n, info.url, info.name, info.n);
+            Node.SectionOpen => |info| {
+                try out.print("<section id=\"{}\"><h{}>{}</h{}>\n", info.url, info.n, info.name, info.n);
             },
             Node.SeeAlso => |items| {
                 try out.write("<p>See also:</p><ul>\n");
diff --git a/doc/langref.html.in b/doc/langref.html.in
index 60ba09d39197..22fcb599ec5d 100644
--- a/doc/langref.html.in
+++ b/doc/langref.html.in
@@ -71,14 +71,17 @@
           border-bottom: 1px solid grey;
         }
       }
+      #nav .visible-section {
+        font-weight: bold;
+      }
     </style>
   </head>
   <body>
-    <div id="nav">
+    <nav id="nav">
       <h3>Index</h3>
       {#nav#}
-    </div>
-    <div id="contents">
+    </nav>
+    <article id="contents">
       {#header_open|Introduction#}
       <p>
       Zig is an open-source programming language designed for <strong>robustness</strong>,
@@ -7421,7 +7424,37 @@ ContainerDecl = option("extern" | "packed")
         <li>Together we serve end users.</li>
       </ul>
       {#header_close#}
-    </div>
+    </article>
+    <script>
+// Highlight the navigation links of visible sections.
+// This makes it easier to find one's current position
+// in the table of contents sidebar.
+function showPlaceInToC() {
+    const sectionToNavLink = new Map();
+    const observer = new IntersectionObserver(entries => {
+        entries.forEach(entry => {
+            const link = sectionToNavLink.get(entry.target)
+            if (entry.isIntersecting) {
+                link.classList.add("visible-section");
+            } else {
+                link.classList.remove("visible-section");
+            }
+        })
+    }, {
+        rootMargin: "-25% 0%", // Ignore top and bottom edges of viewport
+    });
+    document.querySelectorAll("#nav a").forEach(link => {
+        const dest = document.getElementById(link.hash.slice(1));
+        if (dest) {
+            sectionToNavLink.set(dest, link);
+            observer.observe(dest);
+        }
+    });
+};
+if (window.IntersectionObserver) {
+    document.addEventListener("DOMContentLoaded", showPlaceInToC);
+}
+    </script>
     <script>
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