testing/web-platform/tests/css/css-text/white-space/white-space-empty-text-sibling.html


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<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-text-3/#white-space-rules">
<link rel="match" href="../../reference/pass_if_two_words.html">
<p>There should be a space between "two" and "words" below.</p>
<div id="block"> <span>words</span></div>
<script>
  block.insertBefore(document.createTextNode(""), block.firstChild);
  block.insertBefore(document.createTextNode(""), block.firstChild);
  block.offsetTop;
  block.firstChild.data = "two";
</script>