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chromium/third_party/blink/web_tests/external/wpt/css/selectors/has-style-sharing-007-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=1869771">
<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>