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chromium/chrome/test/data/web_apps/get_manifest.html 

<!DOCTYPE html>
<head>
  <link rel="manifest" id="linkManifest">
</head>
<script>
  // The manifest URL must be specified as the GET value
  // e.g.: get_manifest.html?basic.json
  linkManifest.href = location.search.slice(1);
</script>