legend-dynamic-update.html

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<!DOCTYPE html>

<html class=reftest-wait>

<title>legend and dynamic update</title>

<link rel=fieldset-foo-ref.html>

<p>There should be a normal fieldset below with the legend "Foo".</p>

<fieldset>

  <legend>F</legend>

</fieldset>

<script>

  const legend = document.querySelector('legend');

  // force layout

  legend.offsetTop;

  requestAnimationFrame(() => {

    legend.textContent += "oo";

    requestAnimationFrame(() => {

      document.documentElement.removeAttribute('class');

});

});

</script>