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<!DOCTYPE html>
<meta charset="utf-8">
<title>Tests that getComputedStyle() resolves anchor() functions w.r.t. position-area containing block</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#position-area">
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#anchor-pos">
<link rel="author" name="David Shin" href="mailto:dshin@mozilla.com">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
.abs-cb {
width: 200px;
height: 200px;
border: 5px solid;
position: relative;
}
.anchor {
anchor-name: --a;
width: 50px;
height: 50px;
margin-left: 75px;
background: pink;
}
.positioned {
position: absolute;
position-anchor: --a;
width: 25px;
height: 25px;
background: purple;
}
.top {
bottom: anchor(top);
}
.bottom {
top: anchor(bottom);
}
.left {
right: anchor(left);
}
.right {
left: anchor(right);
}
.bottom.right {
position-area: bottom right;
}
.bottom.left {
position-area: bottom left;
}
.top.right {
position-area: top right;
}
.top.left {
position-area: top left;
}
</style>
<div id=cb class=abs-cb>
<div style="height: 75px;"></div>
<div class=anchor></div>
<div id="top-right" class="positioned top right"></div>
<div id="bottom-right" class="positioned bottom right"></div>
<div id="bottom-left" class="positioned bottom left"></div>
<div id="top-left" class="positioned top left"></div>
</div>
<script>
const opposite = {
'top': 'bottom',
'bottom': 'top',
'left': 'right',
'right': 'left',
};
function test_positioned(y, x) {
test(() => {
const d = document.getElementById(`${y}-${x}`);
const s = getComputedStyle(d);
assert_equals(s.getPropertyValue(opposite[y]), '0px');
assert_equals(s.getPropertyValue(opposite[x]), '0px');
}, `Offsets for ${y} ${x} positioned`);
}
test_positioned('top', 'right');
test_positioned('bottom', 'right');
test_positioned('bottom', 'left');
test_positioned('top', 'left');
</script>
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