layout/reftests/first-line/insertion-in-first-line-7.html


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<!DOCTYPE html>
<style>
  div { color: red; }
  div::first-line { color: green }
</style>
<div id="x"><span id="y">green</span></div>
<script>
  x.offsetWidth;
  y.insertBefore(document.createTextNode('This should be '), y.firstChild);
</script>