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chromium/chrome/test/data/android/download/post.html 

<html><body style="height:100%;">
<form name="post1" action="/post/chrome/test/data/android/download/superbo.txt" method="post">
  <input type="submit" value="POST Submit text"
         style="display:block;position:absolute;top:0;left:0;width:100%;height:100%;">
</form>
</body></html>