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chromium/third_party/blink/web_tests/external/wpt/css/css-overflow/overflow-clip-cant-scroll.html 

<!doctype html>
<html class="reftest-wait">
<meta charset="utf-8">
<title>Overflow: clip can not be scrolled</title>
<link rel="help" href="https://www.w3.org/TR/css-overflow-3/#valdef-overflow-clip">
<link rel="author" title="Scott Violet" href="mailto:[email protected]">
<link rel="match" href="overflow-clip-cant-scroll-ref.html">
<style>
  .parent {
    width: 100px;
    height: 100px;
    overflow: clip;
  }

  .child1, .child2 {
    width: 100px;
    height: 100px;
    flex: none;
  }

  .child1 {
    background-color: green;
  }

  .child2 {
    background-color: red;
  }
</style>
<p>You should see two green squares (no red).
<div id="parent1" class="parent" style="display: flex">
  <div class="child1"></div>
  <div class="child2"></div>
</div>

<div id="parent2" class="parent">
  <div class="child1"></div>
  <div class="child2"></div>
</div>

<script>
onload = function() {
  document.getElementById("parent1").scrollLeft = 100;
  document.getElementById("parent2").scrollTop = 100;
  document.documentElement.removeAttribute("class");
}
</script>