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<!DOCTYPE html>
<link rel="author" title="David Shin" href="mailto:dshin@mozilla.com">
<meta name="assert" content="Ensure that style sharing optimizations do not interfere with :has() selector matching.">
<style>
div {
background: blue;
margin: 1em;
padding: 1em;
}
span {
display: inline-block;
width: 1em;
height: 1em;
}
.has-b {
background: green;
}
.b {
background: purple;
}
</style>
<div><span class="has-b"></span><span class="a"></span></div>
<div><span class="b"></span><span></span></div>