chromium/third_party/blink/web_tests/fast/css/whitespace-between-text-flex-preserve.html

<!doctype html>
<p>
  Both lines below should look the same:
</p>
<div id="target" style="display: flex; white-space: pre;"></div>
<div style="display: flex; white-space: pre;">A  B</div>
<script>
  target.appendChild(document.createTextNode("A"));
  target.appendChild(document.createTextNode(" "));
  target.appendChild(document.createTextNode(" "));
  target.appendChild(document.createTextNode("B"));
</script>