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<!DOCTYPE html>
<title>CSS Anchor Positioning: Invalidation from changing the base style</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/">
<link rel="help" href="https://issues.chromium.org/issues/333608683">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
@position-try --pt {
width: 50px; /* Undo force overflow */
}
#cb {
position: relative;
width: 200px;
height: 200px;
border: 1px solid black;
}
#anchor {
position: absolute;
left: 75px;
top: 75px;
width: 50px;
height: 50px;
background: coral;
anchor-name: --a;
}
#anchored {
position: absolute;
position-anchor: --a;
position-try-fallbacks: --pt flip-start;
inset: 0;
top: anchor(top);
bottom: anchor(bottom);
right: calc(anchor(left) + 5px);
width: 50px;
height: 50px;
background: skyblue;
justify-self: end;
}
#anchored.flip {
background: seagreen;
width: 300px; /* Force overflow */
}
</style>
<div id=cb>
<div id=anchor></div>
<div id=anchored></div>
</div>
<script>
test(() => {
// Initially to the left.
assert_equals(anchored.offsetLeft, 20);
assert_equals(anchored.offsetTop, 75);
// Flips to the right.
anchored.classList.toggle('flip');
assert_equals(anchored.offsetLeft, 75);
assert_equals(anchored.offsetTop, 20);
// Flips to the original position.
anchored.classList.toggle('flip');
assert_equals(anchored.offsetLeft, 20);
assert_equals(anchored.offsetTop, 75);
}, 'The chosen position fallbacks changes when the base style differs');
</script>
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