File: first-line-first-letter-insert-crash.html

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<!DOCTYPE html>
<title>Should not crash when inserting an element inside a :first-line pseudo.</title>
<link rel="help" href="https://drafts.csswg.org/css-pseudo-4/">
<style>
p:first-line, p:first-letter {
  font-family: serif;
}
</style>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<p id=target>
  test<sup>sup</sup>
</p>
<script>
test(()=>{
  const target = document.getElementById('target');
  target.insertBefore(document.createElement('img'), target.lastChild)
});
</script>