File: align-content-block-simple-height-change.html

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<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-align/#distribution-block">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
body {
  margin: 0;
}
</style>

<div id="target" style="height: 200px;">
  <div style="align-content: center; height: 100%;">
    <div style="height: 60px;" id="content"></div>
  </div>
</div>

<script>
// Blink has an optimization that it skips child layout if only the container
// height is changed. This test ensures the opmiziation is not used for
// a non-normal align-content value.
test(() => {
  document.body.offsetTop;
  assert_equals(content.offsetTop, (200 - 60) / 2);
  target.style.height = '100px';
  assert_equals(content.offsetTop, (100 - 60) / 2);
}, 'Updating a container height should align the content again');
</script>