| <!DOCTYPE html> | |
| <html id="a"> | |
| <link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1674011"> | |
| <style> | |
| :not(animateTransform) { columns: 1px } | |
| </style> | |
| <script> | |
| function go() { | |
| a.appendChild(b) | |
| } | |
| function eh() { | |
| a.appendChild(c) | |
| } | |
| </script> | |
| <body onload=go()> | |
| <data id="b">x</command> | |
| <dir style="column-span: all">x</dir> | |
| <details id="c" ontoggle="eh()" open="">x</details> | |
| <iframe align="right">x</iframe> |