<!DOCTYPE html>
<link rel="author" title="David Shin" href="mailto:dshin@mozilla.com">
<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>
