layout/style/crashtests/1331272.html


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<!doctype html>
<style>
  div::before {
    content: "PASS";
    display: none;
  }
  .foo::before {
    display: none;
  }
</style>
<div></div>
<script>
window.onload = function() {
  document.querySelector('div').className = "foo";
}
</script>