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chromium/third_party/blink/web_tests/external/wpt/css/selectors/has-style-sharing-005-ref.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=1793012">
<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-c {
  background: green;
}

.c {
  background: purple;
}
</style>
<div><span class="b"><span class="has-c"></span></span><span class="a"></span></div>
<div><span class="b"><span class="c"></span></span><span></span></div>