chromium/content/test/data/accessibility/mac/attributed-string/underline.html

<!--
@SCRIPT:
  tr_underline:= underline.AXTextMarkerRangeForUIElement(underline)
  underline.AXAttributedStringForTextMarkerRange(tr_underline)
-->
<!DOCTYPE html>
<div id="underline">This text is <u>underline</u></div>