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<!DOCTYPE html>
<title>CSS Anchor Positioning: position-try-order behavior with margins</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#position-try-order-property">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#cb {
position: absolute;
width: 400px;
height: 400px;
border: 1px solid black;
}
#target, #ref {
position: absolute;
left: 450px; /* force fallback */
height: 40px;
background-color: skyblue;
}
#ref {
background-color: seagreen;
}
@position-try --margin {
left:0px;
right:0px;
margin: 100px;
}
@position-try --no-margin {
left:0px;
right:0px;
}
</style>
<style id=style>
</style>
<div id=cb>
<div id=target></div>
<div id=ref></div>
</div>
<script>
// Test that an element with the specified `position_try` gets the same
// position as a reference element with `position_try_expected`.
function test_position_try_order(position_try, position_try_expected) {
test((t) => {
style.textContent = `
#target {
position-try: ${position_try};
}
#ref {
position-try: ${position_try_expected};
}
`;
assert_true(CSS.supports('position-try', 'normal --x'));
assert_equals(target.offsetLeft, ref.offsetLeft, 'offsetLeft');
assert_equals(getComputedStyle(target).marginLeft, getComputedStyle(ref).marginLeft, 'marginLeft');
}, `${position_try} | ${position_try_expected}`);
}
// Margin does not affect the inset-modified containing block size so the first option should get picked.
test_position_try_order('most-width --margin, --no-margin', '--margin');
test_position_try_order('most-width --no-margin, --margin', '--no-margin');
test_position_try_order('most-height --margin, --no-margin', '--margin');
test_position_try_order('most-height --no-margin, --margin', '--no-margin');
</script>
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