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<!DOCTYPE html>
<title>Active selection after incremental selection update</title>
<link rel="author" title="Martin Robinson" href="mailto:mrobinson@igalia.com">
<div>
<span id="span1">1234<span id="span2">1234</span></span>
</div>
<script>
let span1Text = span1.firstChild;
getSelection().setBaseAndExtent(span1Text, 0, span1Text, 4);
</script>