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chromium/third_party/blink/web_tests/external/wpt/css/selectors/has-style-sharing-pseudo-003.html 

<!DOCTYPE html>
<link rel="author" title="David Shin" href="mailto:[email protected]">
<link rel="help" href="https://drafts.csswg.org/selectors-4/#relational">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1876962">
<link rel="match" href="has-style-sharing-pseudo-003-ref.html">
<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;
}

:has(> .a) .b::after {
  font: 15px/1 ahem;
  content: 'x';
}
</style>
<div><span class="b"></span><span class="a"></span><span></span></div>
<div><span class="b"></span></div>