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Test Info:
- Manifest: layout/base/crashtests/crashtests.list
<style>
* { position: absolute; }
#a, button::first-line { display: grid; }
</style>
<script>
function go() {
a.insertBefore(document.createElement("a"), b);
}
</script>
<body onload=go()>
<button id="a">
<span id="b">