| <!-- Quirks mode --> |
| <link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com"> |
| <link rel="author" title="Mozilla" href="https://www.mozilla.org/"> |
| <link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1903652"> |
| |
| <style> |
| * { |
| font-size-adjust: 0; |
| column-width: 0; |
| vertical-align: 7; |
| } |
| </style> |
| <script> |
| window.requestIdleCallback(() => { |
| a.appendChild(b) |
| }) |
| </script> |
| <mfrac id="a" style="border-style: solid"> |
| <mo>a</mo> |
| <mn>a</mn> |
| <textarea style="float: left">a</textarea> |
| <sub> |
| <menu id="b"> |
