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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>
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