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<!DOCTYPE html>
<title>CSS Anchor Positioning Test: anchor()/anchor-size() functions in CSS Typed OM</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/">
<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/9598">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#cb {
position: relative;
width: 100px;
height: 100px;
border: 1px solid black;
}
#anchor {
position: absolute;
left: 10px;
top: 10px;
width: 20px;
height: 20px;
background: coral;
anchor-name: --a;
}
#target {
position: absolute;
background: skyblue;
position-anchor: --a;
left: anchor(right);
top: calc(anchor(bottom) + 5px);
width: anchor-size(--unknown width, 25px);
height: calc(anchor-size(height) * 2);
}
</style>
<div id=cb>
<div id=anchor></div>
<div id=target></div>
</div>
<script>
function assert_unit_value(actual, expected) {
assert_true(actual instanceof CSSUnitValue);
assert_true(expected instanceof CSSUnitValue);
assert_equals(actual.value, expected.value);
assert_equals(actual.unit, expected.unit);
}
test(() => {
assert_unit_value(target.computedStyleMap().get('left'), CSS.px(30));
assert_unit_value(target.computedStyleMap().get('top'), CSS.px(35));
}, 'anchor() computes to pixels');
test(() => {
assert_unit_value(target.computedStyleMap().get('width'), CSS.px(25));
assert_unit_value(target.computedStyleMap().get('height'), CSS.px(40));
}, 'anchor-size() computes to pixels');
</script>
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