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chromium/components/test/data/web_view/two_iframes_with_green.html 

<html>
  <head>
    <title>M-M-Multi-green!</title>
  </head>
  <body>
    <p>Green.</p>
    <iframe src="the_word_green_five_times.html"></iframe>
    <p>Green??</p>
    <iframe src="the_word_green_five_times.html"></iframe>
    <p>Green!!</p>
  </body>
</html>