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chromium/third_party/blink/web_tests/fast/body-propagation/overflow/007-declarative.xhtml 

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
 <head>
  <title>overflow on body should not propagate to the viewport when not child of root</title>
  <style>
   html { overflow:hidden; }
   body { overflow:scroll; width:10em; height:10em; border:thin solid; display:block; color:navy; }
   .filler { color:gray; }
  </style>
 </head>
 
<bogus><body>
  <p>There should be scrollbars for this box -- not for the viewport.</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></bogus></html>