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<!DOCTYPE html>
<title>CSS Anchor Positioning: inset-area()</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#position-try-options">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#cb {
position: relative;
width: 200px;
height: 200px;
border: 1px solid black;
}
#anchor {
position: absolute;
left: 100px;
top: 100px;
width: 80px;
height: 80px;
background-color: tomato;
anchor-name: --a;
}
#target, #ref {
position: absolute;
width: 40px;
height: 40px;
background-color: skyblue;
inset-area: bottom right;
position-anchor: --a;
}
#ref {
background-color: seagreen;
}
</style>
<style id=style>
</style>
<div id=cb>
<div id=anchor></div>
<div id=target></div>
<div id=ref></div>
</div>
<script>
// Test that a given inset-area() produces the same result as a reference
// element that is styled with an inset-area declaration directly.
function test_inset_area_fn(inset_area_function, inset_area_expected) {
test((t) => {
t.add_cleanup(() => {
style.textContent = '';
});
style.textContent = `
#target {
position-try-options: ${inset_area_function};
}
#ref {
inset-area: ${inset_area_expected};
}
`;
assert_equals(target.offsetLeft, ref.offsetLeft, 'offsetLeft');
assert_equals(target.offsetTop, ref.offsetTop, 'offsetTop');
}, `${inset_area_function}, ${inset_area_expected}`);
}
test_inset_area_fn('inset-area(top left)', 'top left');
test_inset_area_fn('inset-area(span-top left)', 'span-top left');
test_inset_area_fn('inset-area(top span-left)', 'top span-left');
test_inset_area_fn('inset-area(top center)', 'top center');
test_inset_area_fn('inset-area(left center)', 'left center');
test_inset_area_fn('inset-area(start center)', 'start center');
test_inset_area_fn('inset-area(center start)', 'center start');
</script>
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