feat: support all HTML elements allowed by Glitch (#1233)

Closes https://github.com/elk-zone/elk/issues/1230

composables/content-parse.ts

@@ -35,12 +35,35 @@ const sanitizer = sanitize({
   code: {
     class: filterClasses(/^language-\w+$/),
   },
-  // other elements supported in glitch
-  h1: {},
-  ol: {},
-  ul: {},
-  li: {},
+  // Other elements supported in glitch, as seen in
+  // https://github.com/glitch-soc/mastodon/blob/13227e1dafd308dfe1a3effc3379b766274809b3/lib/sanitize_ext/sanitize_config.rb#L75
+  abbr: {
+    title: keep,
+  },
+  del: {},
+  blockquote: {
+    cite: filterHref(),
+  },
+  b: {},
+  strong: {},
+  u: {},
+  sub: {},
+  sup: {},
+  i: {},
   em: {},
+  h1: {},
+  h2: {},
+  h3: {},
+  h4: {},
+  h5: {},
+  ul: {},
+  ol: {
+    start: keep,
+    reversed: keep,
+  },
+  li: {
+    value: keep,
+  },
 })
 
 /**
@@ -255,6 +278,10 @@ function filterClasses(allowed: RegExp) {
   }
 }
 
+function keep(value: string | undefined) {
+  return value
+}
+
 function set(value: string) {
   return () => value
 }

tests/__snapshots__/content-rich.test.ts.snap

@@ -92,7 +92,7 @@ exports[`content-rich > handles formatting from servers 1`] = `
 <p></p>
 <ul>
   <li>This is an indented bulleted list (not just asterisks).</li>
-  <li></li>
+  <li><strong>This line is bold.</strong></li>
   <li><em>This line is italic.</em></li>
 </ul>
 <ol>