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chromium/content/test/data/accessibility/aria/aria-orientation.html 

<!--
@MAC-ALLOW:AXOrientation=*
@WIN-ALLOW:IA2_STATE_VERTICAL
@WIN-ALLOW:IA2_STATE_HORIZONTAL
@BLINK-ALLOW:vertical
@BLINK-ALLOW:horizontal
@AURALINUX-ALLOW:vertical
@AURALINUX-ALLOW:horizontal
-->
<!DOCTYPE html>
<html>
 <body>
  <div role="combobox"></div>
  <div role="combobox" aria-orientation="horizontal"> </div>
  <div role="combobox" aria-orientation="vertical"></div>
  <div role="listbox"></div>
  <div role="listbox" aria-orientation="horizontal"> </div>
  <div role="listbox" aria-orientation="vertical"></div>
  <div role="menu"></div>
  <div role="menu" aria-orientation="horizontal"> </div>
  <div role="menu" aria-orientation="vertical"></div>
  <div role="menubar"></div>
  <div role="menubar" aria-orientation="horizontal"> </div>
  <div role="menubar" aria-orientation="vertical"></div>
  <div role="radiogroup"></div>
  <div role="radiogroup" aria-orientation="horizontal"> </div>
  <div role="radiogroup" aria-orientation="vertical"></div>
  <div role="scrollbar"></div>
  <div role="scrollbar" aria-orientation="horizontal"> </div>
  <div role="scrollbar" aria-orientation="vertical"></div>
  <div role="slider"></div>
  <div role="slider" aria-orientation="horizontal"> </div>
  <div role="slider" aria-orientation="vertical"></div>
  <div role="separator"></div>
  <div role="separator" aria-orientation="horizontal"> </div>
  <div role="separator" aria-orientation="vertical"></div>
  <div role="tablist"></div>
  <div role="tablist" aria-orientation="horizontal"> </div>
  <div role="tablist" aria-orientation="vertical"></div>
  <div role="toolbar"></div>
  <div role="toolbar" aria-orientation="horizontal"> </div>
  <div role="toolbar" aria-orientation="vertical"></div>
  <div role="tree"></div>
  <div role="tree" aria-orientation="horizontal"> </div>
  <div role="tree" aria-orientation="vertical"></div>
  <div role="treegrid"></div>
  <div role="treegrid" aria-orientation="horizontal"> </div>
  <div role="treegrid" aria-orientation="vertical"></div>

 </body>
</html>