fix: readme rendering result lacks anchor point jump (#994)

Author: btea

server/utils/readme.ts

@@ -139,23 +139,24 @@ const ALLOWED_TAGS = [
 ]
 
 const ALLOWED_ATTR: Record<string, string[]> = {
-  a: ['href', 'title', 'target', 'rel'],
-  img: ['src', 'alt', 'title', 'width', 'height', 'align'],
-  source: ['src', 'srcset', 'type', 'media'],
-  button: ['class', 'title', 'type', 'aria-label', 'data-copy'],
-  th: ['colspan', 'rowspan', 'align'],
-  td: ['colspan', 'rowspan', 'align'],
-  h3: ['id', 'data-level', 'align'],
-  h4: ['id', 'data-level', 'align'],
-  h5: ['id', 'data-level', 'align'],
-  h6: ['id', 'data-level', 'align'],
-  blockquote: ['data-callout'],
-  details: ['open'],
-  code: ['class'],
-  pre: ['class', 'style'],
-  span: ['class', 'style'],
-  div: ['class', 'style', 'align'],
-  p: ['align'],
+  '*': ['id'], // Allow id on all tags
+  'a': ['href', 'title', 'target', 'rel'],
+  'img': ['src', 'alt', 'title', 'width', 'height', 'align'],
+  'source': ['src', 'srcset', 'type', 'media'],
+  'button': ['class', 'title', 'type', 'aria-label', 'data-copy'],
+  'th': ['colspan', 'rowspan', 'align'],
+  'td': ['colspan', 'rowspan', 'align'],
+  'h3': ['data-level', 'align'],
+  'h4': ['data-level', 'align'],
+  'h5': ['data-level', 'align'],
+  'h6': ['data-level', 'align'],
+  'blockquote': ['data-callout'],
+  'details': ['open'],
+  'code': ['class'],
+  'pre': ['class', 'style'],
+  'span': ['class', 'style'],
+  'div': ['class', 'style', 'align'],
+  'p': ['align'],
 }
 
 // GitHub-style callout types
@@ -397,6 +398,14 @@ ${html}
 
   const rawHtml = marked.parse(content) as string
 
+  // Helper to prefix id attributes with 'user-content-'
+  const prefixId = (tagName: string, attribs: sanitizeHtml.Attributes) => {
+    if (attribs.id && !attribs.id.startsWith('user-content-')) {
+      attribs.id = `user-content-${attribs.id}`
+    }
+    return { tagName, attribs }
+  }
+
   const sanitized = sanitizeHtml(rawHtml, {
     allowedTags: ALLOWED_TAGS,
     allowedAttributes: ALLOWED_ATTR,
@@ -436,6 +445,11 @@ ${html}
         }
         return { tagName, attribs }
       },
+      div: prefixId,
+      p: prefixId,
+      span: prefixId,
+      section: prefixId,
+      article: prefixId,
     },
   })