chromium/third_party/blink/web_tests/external/wpt/css/css-flexbox/order/order-abs-children-painting-order.html

<!DOCTYPE html>
<title>CSS Test: flex order affects painting order of absolutely positioned boxes inside flex</title>
<link rel="author" title="Dennis Schubert" href="mailto:[email protected]">
<link rel="author" href="https://mozilla.org" title="Mozilla">
<link rel="help" href="https://drafts.csswg.org/css-flexbox/#propdef-order">
<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=606208">
<link rel="match" href="../../reference/ref-filled-green-100px-square-only.html">
<meta name="assert" content="This test check that absolutely positioned boxes inside flex items have their painting orders affected by 'order'.">
<style>
  #test {
    display: flex;
    position: relative;
    height: 100px;
    width: 100px;
  }

  #order-1 {
    order: 1;
  }

  #order-2 {
    order: 2;
  }

  .inner {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    top: 0;
  }

  #order-1 .inner {
    background-color: red;
  }

  #order-2 .inner {
    background-color: green;
  }
</style>
<p>Test passes if there is a filled green square.</p>
<div id="test">
  <div id="order-2">
    <div class="inner"></div>
  </div>
  <div id="order-1">
    <div class="inner"></div>
  </div>
</div>