<!DOCTYPE html>

<html>
<head>
  <style>
    body {
      width: 2000px;
    }
    
    .container {
      position: relative;
      height: 450px;
      width: 800px;
      margin: 20px auto;
      background-color: #eee;
      border: 1px solid black;
    }
    
    .left {
      float: left;
      width: 200px;
      height: 100%;
      background-color: #ddd;
    }
    
    .sticky {
      position: sticky;
      display: inline-block;
      background: silver;
      margin: 4px;
      height: 60px;
      width: 300px;
    }
    
    .box {
      display: none;
      width: 100px;
      height: 100px;
      background-color: blue;
    }
  </style>
  <script>
    if (window.testRunner) {
      testRunner.waitUntilDone();
      testRunner.dumpAsText();
    }

    function doScroll()
    {
      window.setTimeout(function() {
        window.scrollTo(800, 0);
        if (window.testRunner) {
          document.getElementById('results').innerText = window.internals.scrollingStateTreeAsText();
          testRunner.notifyDone();
        }
      }, 10);
    }
    
    window.addEventListener('load', doScroll, false);
  </script>
</head>
<body>
  <div class="container">
    <div class="left"></div>
    <div class="horizontal sticky" style="left: 20px">Left sticky <div class="composited box"></div></div>
    <div class="horizontal sticky" style="right: 20px">Right sticky <div class="composited box"></div></div>
    <div class="horizontal sticky" style="left: 20%">Left % sticky <div class="composited box"></div></div>
    <div class="horizontal sticky" style="right: 20%">Right % sticky <div class="composited box"></div></div>

    <div class="horizontal sticky" style="left: 20px; right: 20px">Left and Right <div class="composited box"></div></div>
    <div class="horizontal sticky" style="left: 20%; right: 20%">Left and Right %<div class="composited box"></div></div>
  </div>
<pre id="results"></pre>
</body>
</html>