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<!DOCTYPE html>
<link rel="author" title="David Shin" href="mailto:dshin@mozilla.com">
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
<meta name="assert" content="Ensure that style sharing optimizations do not interfere with :has() selector matching.">
<style>
div {
width: 20px;
height: 20px;
}
.after::after {
font: 15px/1 Ahem;
content: "x";
}
</style>
<div><div class="after"><span></span></div></div>
<div><div></div></div>