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chromium/third_party/blink/web_tests/fast/events/touch/gesture/resources/scroll-inside-editable-iframe-promise-resolve-on-load.html 

<!DOCTYPE html>
<style>
  body {
    margin: 0;
  }

  .greenbox {
    width: 100px;
    height: 100px;
    background: green;
  }

  .redbox {
    width: 100px;
    height: 100px;
    background: red;
  }
</style>
<body onload="parent.iframeLoadResolve()" contenteditable>
  <div class="greenbox"></div>
  <div class="redbox"></div>
  <div class="greenbox"></div>
  <div class="redbox"></div>
  <div class="greenbox"></div>
  <div class="redbox"></div>
  <div class="greenbox"></div>
  <div class="redbox"></div>
</body>