css/css-flexbox/abspos/position-absolute-014.html

<!doctype html>
<title>abspos flex children with top margins</title>
<link rel="author" title="Daniel Holbert" href="mailto:dholbert@mozilla.org">
<link rel="author" title="David Grogan" href="mailto:dgrogan@chromium.org">
<link rel="help" href="https://drafts.csswg.org/css-flexbox/#abspos-items">
<link rel="bookmark" href="https://crbug.com/808750">
<meta name="flags" content="dom">

<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<style>
.container {
  display: flex;
  background: lightgray;
  width: 250px;
  height: 48px;

  /* Add some margin so that overflowing things don't stomp on each other: */
  margin: 50px 10px;
  float: left;
  position: relative;
}

.contentBox {
  position: absolute;
  /* Margin-box is 100px tall (2px of border + 98px of content): */
  border: 1px solid teal;
  height: 98px;

  width: 98px;
  left: 20px;
}
.marginBox {
  position: absolute;
  /* Margin-box is 100px tall
    (60px of margin-top + 2px of border + 38px of content): */
  margin-top: 60px;
  border: 1px solid orange;
  height: 38px;

  width: 100px;
  left: 120px;
}
</style>
<div class="container">
  <div class="contentBox">
    aaa
  </div>
  <div class="marginBox">
    bbb
  </div>
</div>

<div class="container" style="align-items: flex-end">
  <div class="contentBox">
    aaa
  </div>
  <div class="marginBox">
    bbb
  </div>
</div>

<div class="container" style="align-items: center">
  <div class="contentBox">
    aaa
  </div>
  <div class="marginBox">
    bbb
  </div>
</div>
<div id=log style="clear:both"></div>

<script>
test(function() {
  var elements = document.querySelectorAll(".contentBox, .marginBox");
  for (var i = 0; i < elements.length; i+=2) {
    assert_equals(elements[i].getBoundingClientRect().bottom,
                  elements[i+1].getBoundingClientRect().bottom);
  }
}, "The bottom of each pair of boxes should be the same");
</script>