Merge pull request #6 from marijnh/master

Fork Sync

Author: github-actions[bot]

html/errata.html

@@ -67,7 +67,7 @@ <h2>Chapter 11</h2>
 
 <h2>Chapter 14</h2>
 
-<p><strong>Page 231</strong> <em>Moving Through the Tree</em>: Below
+<p><strong>Page 231</strong> (5th) <em>Moving Through the Tree</em>: Below
 the code example, the text claims
 that <code>for</code>/<code>of</code> loops don't work on DOM child
 lists. But in current (even as of the book's release) browsers they
@@ -93,8 +93,9 @@ <h2>Chapter 16</h2>
 
 <h2>Chapter 19</h2>
 
-<p><strong>Page 336</strong> <em>The State</em>: The text mentions the
-property `fillColor` where it should say `fillStyle` instead.
+<p><strong>Page 336</strong> (5th) <em>The State</em>: The text mentions the
+property <code>fillColor</code> where it should
+say <code>fillStyle</code> instead.
 
 <h2>Chapter 20</h2>
 

src/render_html.js

@@ -54,7 +54,10 @@ function maybeSplitInlineCode(html) {
 const seenIDs = Object.create(null)
 function anchor(token) {
   let id = token.hashID
-  if (!id || id in seenIDs) return ""
+  if (id in seenIDs) for (let i = 1;; i++) {
+    let ext = id + "_" + i
+    if (!(ext in seenIDs)) { id = ext; break }
+  }
   seenIDs[id] = true
   return `<a class="${id.charAt(0)}_ident" id="${id}" href="#${id}" tabindex="-1" role="presentation"></a>`
 }