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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>
.cousin {
width: 1em;
height: 1em;
background: purple;
}
.special.cousin.has {
background: blue;
}
</style>
<div class="sib">
<div class="cousin"></div>
</div>
<br>
<div class="sib">
<div class="cousin special"></div>
<br>
<div class="cousin special has"></div>
</div>