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Test Info:
- Manifest: layout/base/crashtests/crashtests.list
<script>
function go() {
document.body.offsetHeight;
b.insertAdjacentHTML("afterBegin", a.innerHTML)
}
</script>
<body onload=go()>
<details id="b" open="true" style="column-count: 1">
A
<div id="a" style="column-span: all">
<!-- this comment is essential to trigger the assertion. -->
</div>
B
</details>
</body>