<!doctype html>
<html>
<body>
  <div style="font-size: 5em;"><span>foo</span>bar</div>
  <div><span>foo</span>bar</span><span style="font-size: 6em;">&nbsp;</span></div>
  <div><span style="font-size: 5em;">Foo<span>Bar</span></span></div>
  <div>Foo<span>Bar</span><span style="font-size: 6em;">&nbsp;</span></div>
</body>
</html>