nth-of-namespace-class-invalidation-crash.html

Enable keyboard shortcuts

<!DOCTYPE html>

<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1903671">

<style>

*|*:nth-child(+0n of S) { color: red }

</style>

<script>

document.addEventListener("DOMContentLoaded", () => {

  let a = document.createElementNS("http://www.w3.org/1999/xhtml", "details")

  let b = document.createElementNS("http://www.w3.org/1999/xhtml", "summary")

  a.appendChild(b)

  document.documentElement.appendChild(a)

  b.offsetTop;

  b.setAttributeNS("h", "class", "")

})

</script>