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chromium/third_party/blink/web_tests/fast/body-propagation/overflow/005-declarative.xhtml 

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
 <head>
  <title>overflow on body should propagate to the viewport even when it has bogus siblings</title>
  <style>
   html { overflow:visible; }
   body { display:block; overflow:scroll; width:10em; height:10em; border:thin solid; color:navy; }
   .filler { color:gray; }
  </style>
 </head>
 <body xmlns="urn:foo:bogus"/><body>
  <p>There should be scrollbars for the viewport -- not for this box. (Additionally, there should be a box above that does have scrollbars.)</p>
  <p class="filler">This is filler text.</p>
  <p class="filler">This is filler text.</p>
  <p class="filler">This is filler text.</p>
  <p class="filler">This is filler text.</p>
 </body>
</html>