File: position-try-position-anchor.html

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<!DOCTYPE html>
<title>CSS Anchor Positioning Test: @position-try can set position-anchor</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-1/#fallback">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/check-layout-th.js"></script>
<script src="support/test-common.js"></script>
<style>
  #cb {
    position: relative;
    width: 400px;
    height: 400px;
  }
  .anchor {
    width: 100px;
    height: 100px;
  }
  #anchor-a {
    anchor-name: --a;
    /* Makes #anchored overflow when aligned with right edge */
    margin-left: 100px;
  }
  #anchor-b {
    anchor-name: --b;
  }
  #anchored {
    position: absolute;
    left: anchor(right);
    width: 300px;
    height: 100px;
    position-anchor: --a;
    position-try-fallbacks: --pf;
  }
  @position-try --pf {
    position-anchor: --b;
  }
</style>
<body onload="checkLayoutForAnchorPos('#anchored')">
<div id="cb">
  <div id="anchor-a" class="anchor"></div>
  <div id="anchor-b" class="anchor"></div>
  <div id="anchored" data-offset-x="100"></div>
</div>