File: auto-margins-position-area.html

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<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/">
<style>
.container {
  position: relative;
  width: 100px;
  height: 100px;
  border: solid 3px;
}

.anchor {
  anchor-name: --a;
  background: lime;
  width: 20px;
  height: 20px;
  position: relative;
  left: 20px;
  top: 30px;
}

.abspos {
  background: cornflowerblue;
  margin: auto;
  position: absolute;
  position-area: bottom;
  position-anchor: --a;
}
</style>

<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/check-layout-th.js"></script>
<body onload="checkLayout('.abspos')">
<div class="container">
  <div class="anchor"></div>
  <div class="abspos" data-offset-x=10 data-offset-y=65>
    <div style="width: 80px; height: 20px;"></div>
  </div>
</div>