<!DOCTYPE html>
<!--
 | Modifying a style that affects stacking contexts should cause the
 | stacking contexts of potentially impacted boxes to be recalculated.
 -->
<html>
<head>
  <style>
    .light-green, .dark-green, .blue-positive, .blue-negative {
      position: absolute;
      width: 100px;
      height: 100px;
    }
    .light-green {
      left: 0px;
      top: 0px;
      background-color: #B7E1CD;
      z-index: 1;
    }
    .dark-green {
      left: 30px;
      top: 30px;
      background-color: #0B8043;
      z-index: -1;
    }
    .blue-positive {
      left: 40px;
      top: 40px;
      background-color: #4285F4;
      z-index: 3;
    }
    .blue-negative {
      left: 40px;
      top: 40px;
      background-color: #4285F4;
      z-index: -3;
    }
    .blue-container {
      position: absolute;
      left: 20px;
      top: 20px;

      width: 150px;
      height: 150px;

      background-color: #4285F4;
      z-index: -10;
    }
  </style>
  <script>
    if (window.testRunner) {
      window.testRunner.waitUntilDone();
    }

    window.onload = function() {
      if (window.testRunner) {
        window.testRunner.DoNonMeasuredLayout();
      }

      var node = document.getElementById('node');
      node.className = "blue-negative";

      if (window.testRunner) {
        window.testRunner.notifyDone();
      }
    }
  </script>
</head>
<body>
  <div class="blue-container">
    <div id="node" class="blue-positive"></div>
    <div class="dark-green"></div>
  </div>
  <div class="light-green"></div>
</body>
</html>