squash-overflow-hidden-contents.html

<!DOCTYPE html>
<style type="text/css" media="screen">
  .container {
    display: inline-block;
    width: 200px; 
    height: 200px; 
    overflow: hidden;
    margin: 10px;
    border: 1px solid black;
  }
  
  .inner {
    width: 100%;
    height: 1000px;
    background-color: blue;
  }
  
  .compositing {
    position: absolute;
    top: 20px;
    left: 20px;
    width: 100px;
    height: 100px;
    will-change: transform;
  }
</style>
<!-- Go into compositing. -->
<div class="compositing"></div>

<!-- Test repainting when the graphicsLayer offsetFromRenderer changes -->
<!-- You should see one green square, and no red -->
<div class="container" style="position: relative;">
  <div class="inner" style="position: relative;">
  </div>
</div>

chromium/third_party/blink/web_tests/compositing/squashing/squash-overflow-hidden-contents.html