File: anchor-position-dynamic-004.html

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<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-anchor-1/#anchor-pos">
<link rel="author" href="mailto:kojii@chromium.org">
<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;
}
#anchor1 {
  anchor-name: --a1;
  margin-left: 15px;
  width: 30px;
  height: 20px;
  background: red;
}
.after #anchor1 {
  margin-left: 50px;
}
.target {
  position: absolute;
  left: anchor(--a1 left);
  top: anchor(--a1 top);
  right: anchor(--a1 right);
  bottom: anchor(--a1 bottom);
  background: lime;
}
</style>
<body>
  <div class="cb">
    <div style="contain: strict; height: 50px">
      <div class="spacer" style="height: 10px"></div>
      <div id="anchor1"></div>
    </div>

    <div class="target"
         data-offset-x=50 data-offset-y=10
         data-expected-width=30 data-expected-height=20></div>
  </div>
<script type="module">
document.body.classList.add('after');
await checkLayoutForAnchorPos('.target');
</script>
</body>