Answer principles round 4: 0 🔴, 1 🟡 (0 misread); an item's line names the missing </li> before the next item too

src/html/parse/html-to-adf.test.ts

@@ -290,6 +290,8 @@ const messages: readonly (readonly [string, string])[] = [
   ['<ul>\n<li>see <a href="https://x.test/?a=1&b=2">x</a></li>\n</ul>\n', '<a> holds its attributes as name="value", each value escaped as text is, then >: found "&b=2\\">x</a></li>\\n</ul>\\n"'],
   ['<ul>\n<li><p>a</p><strong>x</strong></li>\n</ul>\n', 'an item\'s line ends at </li>, or at a line feed before the item\'s next block: found "<strong>x</strong></li>\\n"…'],
   ['<ul>\n<li>Bolt<ul>\n<li>a</li>\n</ul></li>\n</ul>\n', 'an item\'s line ends at </li>, or at a line feed before the item\'s next block: found "<ul>\\n<li>a</li>\\n</ul></l"…'],
+  ['<ul>\n<li>a<li>b</li>\n</ul>\n', 'an item\'s line ends at </li>, or at a line feed before the item\'s next block: found "<li>b</li>\\n</ul>\\n"'],
+  ['<ul>\n<li>a\n<li>b</li>\n</ul>\n', 'an item\'s line ends at </li>, or at a line feed before the item\'s next block: found "<li>b</li>\\n</ul>\\n"'],
   ['<p><strong><b>x</b></strong></p>\n', '<b> as written here is no mark element of the dialect, and a mark element holds text, or one other mark element around text: found "<b>x</b></strong></p>\\n"'],
   ['<p><strong><br>x</strong></p>\n', '<br> as written here is no mark element of the dialect, and a mark element holds text, or one other mark element around text: found "<br>x</strong></p>\\n"'],
   ['<p><em></em></p>\n', 'a mark element holds text, or one other mark element around text: found "</em></p>\\n"'],

src/html/parse/html-to-adf.ts

@@ -252,8 +252,8 @@ function readItemLine(html: string, index: number, open: Open): Result<BlockStep
   const { end, node } = line.value
   if (!html.startsWith('</li>', end) && !html.startsWith('\n', end)) {
     const lineEnd = "an item's line ends at </li>, or at a line feed before the item's next block"
-    // After a line's `</p>`, or before a block, no inline element can stand.
-    const stop = line.value.form === 'bare' && !isBlockStart(html, end) ? misread(html, end, `${lineEnd}, and its text spells < as &lt;`, 'no inline element of the dialect') : { at: end, message: `${lineEnd}: ${foundAt(html, end)}` }
+    // After a line's `</p>`, or before a block or the next item, no inline element can stand.
+    const stop = line.value.form === 'bare' && !isBlockStart(html, end) && startTagName(html, end) !== 'li' ? misread(html, end, `${lineEnd}, and its text spells < as &lt;`, 'no inline element of the dialect') : { at: end, message: `${lineEnd}: ${foundAt(html, end)}` }
     return refused('unmappable-html', stop.message, html, stop.at, open.place)
   }
   const paragraph = asFirstParagraph({ end, node }, line.value.form, html, index, place)