Answer stability round 2: 0 🔴, 2 🟡 (0 misread); an item's line names an inline element only on a bare line short of a block, and two refusals pinned to the character they name

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

@@ -185,6 +185,10 @@ const refusals: Readonly<Record<string, readonly (readonly [string, string])[]>>
     ['<p><span class="adf-carry" data-adf="[]"></span></p>\n', 'unsupported-node-shape at /content/0/content/0 line 1 offset 0'],
     ['<p><span>a</span></p>\n', 'unmappable-html at /content/0/content/0 line 1 offset 0'],
   ],
+  'refuses a misspelled attribute value on the line of the character it names': [
+    ['<ul>\n<li>see <a href="https://x.test/?a\nb&c">x</a></li>\n</ul>\n', 'unmappable-html at /content/0/content/0 line 3 offset 40'],
+    ['<p><strong><a href="https://x.test/?a\nb&c">x</a></strong></p>\n', 'unmappable-html at /content/0/content/0 line 2 offset 38'],
+  ],
   'refuses an edit to what a carry element shows': [
     [`<p>a</p>\n${carry('div', panel, '<p>Check the <b>collation</b>.</p>')}\n`, 'unmappable-html at /content/1 line 2 offset 9'],
     [`<p>Ask ${carry('span', mention, '')}</p>\n`, 'unmappable-html at /content/0/content/1 line 1 offset 0'],
@@ -284,7 +288,10 @@ const messages: readonly (readonly [string, string])[] = [
   ['<ul>\n<li>a<b>b</b></li>\n</ul>\n', '<b> as written here is no inline element of the dialect: found "<b>b</b></li>\\n</ul>\\n"'],
   ['<ul>\n<li>if a < b</li>\n</ul>\n', 'an item\'s line ends at </li>, or at a line feed before the item\'s next block, and its text spells < as &lt;: found "< b</li>\\n</ul>\\n"'],
   ['<ul>\n<li>see <a href="https://x.test/?a=1&b=2">x</a></li>\n</ul>\n', '<a> holds its attributes as name="value", each value escaped as text is, then >: found "&b=2\\">x</a></li>\\n</ul>\\n"'],
-  ['<p><strong><b>x</b></strong></p>\n', '<b> as written here is no mark element of the dialect: found "<b>x</b></strong></p>\\n"'],
+  ['<ul>\n<li><p>a</p><strong>x</strong></li>\n</ul>\n', 'an item\'s line ends at </li>, or at a line feed before the item\'s next block: found "<strong>x</strong></li>\\n"…'],
+  ['<ul>\n<li>Bolt<ul>\n<li>a</li>\n</ul></li>\n</ul>\n', 'an item\'s line ends at </li>, or at a line feed before the item\'s next block: found "<ul>\\n<li>a</li>\\n</ul></l"…'],
+  ['<p><strong><b>x</b></strong></p>\n', '<b> as written here is no mark element of the dialect, and a mark element holds one text, or one mark element holding it: found "<b>x</b></strong></p>\\n"'],
+  ['<p><strong><br>x</strong></p>\n', '<br> as written here is no mark element of the dialect, and a mark element holds one text, or one mark element holding it: found "<br>x</strong></p>\\n"'],
   ['<p><strong><a href="https://x.test/?a=1&b=2">x</a></strong></p>\n', '<a> holds its attributes as name="value", each value escaped as text is, then >: found "&b=2\\">x</a></strong></p>"…'],
   [`<p>a</p>\n${carry('div', panel, '<p>Check the <b>collation</b>.</p>')}\n`, 'a carry element shows its node\'s text as adfToHtml writes it, then ends at </div>; an edit to it is no edit to the node: found "<b>collation</b>.</p></d"…'],
 ]

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

@@ -248,7 +248,9 @@ function readItemLine(html: string, index: number, open: Open): Result<BlockStep
   if (!line.ok) return line
   const { end, node } = line.value
   if (!html.startsWith('</li>', end) && !html.startsWith('\n', end)) {
-    const stop = misread(html, end, "an item's line ends at </li>, or at a line feed before the item's next block, and its text spells < as &lt;", 'no inline element of the dialect')
+    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)}` }
     return refused('unmappable-html', stop.message, html, stop.at, open.place)
   }
   const paragraph = asFirstParagraph({ end, node }, line.value.form, html, index, place)

src/html/parse/inline.ts

@@ -47,7 +47,7 @@ function readMarked(html: string, index: number, place: Place): ReadNode {
     at = tag.end
   }
   if (at === html.length || html.startsWith('<', at)) {
-    const stop = misread(html, at, 'a mark element holds one text, or one mark element holding it', 'no mark element of the dialect')
+    const stop = misread(html, at, 'a mark element holds one text, or one mark element holding it', 'no mark element of the dialect, and a mark element holds one text, or one mark element holding it')
     return refused('unmappable-html', stop.message, html, stop.at, place)
   }
   const text = readText(html, at, marks, place)