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chromium/components/test/data/ad_tagging/multiple_mimes.html 

<html>
  <script src="ad_script.js"></script>
  <link rel="stylesheet" type="text/css" href="style.css">
  <img src="pixel.png"></img>
  <video src="bear-320x240-video-only.webm" preload="auto"></video>
  <iframe src="test.pdf"></iframe>
</html>