| <!doctype html> |
| <link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1902540"> |
| <script> |
| let fuzz = () => { |
| document.body.appendChild(document.createElement("iframe")) |
| document.getElementById("b").appendChild(document.createElement("plaintext")) |
| document.documentElement.offsetHeight; |
| window.frames[0].document.body.appendChild(document.getElementById("a")) |
| window.frames[0].document.body.appendChild(document.getElementById("c")) |
| } |
| </script> |
| <style> |
| :last-child { |
| display: ruby-text-container; |
| } |
| </style> |
| <body onload="fuzz()"> |
| <fieldset id="a"></fieldset> |
| <ruby id="b"> |
| <ul id="c"></ul> |
| </ruby> |
| </body> |
| |
