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

<!--
@SCRIPT:
  tr_strikethrough:= strikethrough.AXTextMarkerRangeForUIElement(strikethrough)
  strikethrough.AXAttributedStringForTextMarkerRange(tr_strikethrough)
-->
<!DOCTYPE html>
<div id="strikethrough">This text is <s>strikethrough</s></div>