File: anchor-center-fallback-transition-behavior.html

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<!DOCTYPE html>
<title>CSS Anchor Positioning Test: Fallback for position-area with implicit anchor centering</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position/">
<link rel="help" href="https://crbug.com/342428030">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  body { margin: 0; }
  #cb {
    position: relative;
    width: 400px;
    height: 100px;
    border: 1px solid black;
  }
  #a1 {
    anchor-name: --a1;
    width: 100px;
    height: 100px;
    background: green;
  }
  #t1 {
    position-anchor: --a1;
    /* transition-behavior exercises bug in Chrome */
    transition-behavior: allow-discrete;
    position: absolute;
    position-area: bottom;
    position-try-fallbacks: --right;
    width: 200px;
    height: 100px;
    background: cyan;
  }
  @position-try --right {
    position-area: right;
  }
</style>
<div id="cb">
  <div id="a1"></div>
  <div id="t1"></div>
</div>
<script>
  test(() => {
    assert_equals(t1.offsetLeft, 100, "Positioned using --right fallback");
  }, "anchor-center aligned bottom anchored element overflowing IMCB");
</script>