composited-negative-zindex-child.html

<!DOCTYPE html>

<html>
<head>
  <style type="text/css" media="screen">
    .box {
      height: 100px;
      width: 100px;
      position: absolute;
      z-index: 0;
    }
    
    .parent {
      border: 1px solid black;
    }
    
    .child {
      top: 10px;
      left: 10px;
      background-color: silver;
      z-index: -1;
    }
  </style>
  <script type="text/javascript" charset="utf-8">
    if (window.testRunner)
      testRunner.dumpAsText();

    function doTest() {
      document.getElementById('child').style.willChange = 'transform';
    }
    window.addEventListener('load', doTest, false);
  </script>
</head>
<body>
  <p>This test should not assert in debug builds.</p>
  <div class="parent box">
    <div id="child" class="child box"></div>
  </div>
</body>
</html>

chromium/third_party/blink/web_tests/compositing/composited-negative-zindex-child.html