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Test Info:

<!doctype html>
<html class="reftest-wait">
<title>Layout is correctly updated when the hypothetical display of an element changes, even though the final computed display doesn't</title>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<link rel="author" title="Mozilla" href="https://mozilla.org">
<link rel="help" href="https://drafts.csswg.org/css2/visudet.html#abs-non-replaced-height" title="10.6.4 Absolutely positioned, non-replaced elements">
<link rel="match" href="hypothetical-box-dynamic-ref.html">
<style>
div {
font: 16px / 1 monospace;
text-align: center;
margin: 5px;
position: relative;
min-height: 30px;
}
span {
position: absolute;
}
.block {
display: block;
}
</style>
<p>Should see two words at the same horizontal position below:</p>
<div>
<span class="block">Foo</span>
</div>
<div>
<span>Foo</span>
</div>
<script>
onload = function() {
requestAnimationFrame(() => requestAnimationFrame(() => {
document.querySelector(".block").className = "";
document.documentElement.className = "";
}));
}
</script>