selection/selection-incremental-change-repaint.html

<!DOCTYPE html>
<title>Active selection after incremental selection update</title>
<link rel="author" title="Martin Robinson" href="mailto:mrobinson@igalia.com">
<link rel="match" href="selection-incremental-change-repaint-ref.html">
<meta name="assert" content="The rendering of a selection should update properly after it changes incrementally.">

<div>
    <span id="span1">1234<span id="span2">1234</span></span>
</div>

<script>
  let span1Text = span1.firstChild;
  let span2Text = span2.firstChild;
  getSelection().setBaseAndExtent(span1Text, 0, span2Text, 3);
  document.body.offsetWidth;
  getSelection().setBaseAndExtent(span1Text, 0, span1Text, 4);
</script>