<!DOCTYPE html>
<body>
<title>Use-after-free when inserting implicit parent selector</title>
<link rel="help" href="https://crbug.com/1380313">
<style>
:root {
  :lang(en), :lang(en) {
  }
}
</style>
<div lang="en"></div>
<script>
  // Allocate a large chunk of memory, to trigger a GC.
  new Int32Array(536870911);
</script>

