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<!DOCTYPE html>
<title>CSS Anchor Positioning: try-tactic, percentage</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#typedef-position-try-options-try-tactic">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#cb {
position: absolute;
width: 400px;
height: 400px;
border: 1px solid black;
}
#anchor {
position: absolute;
left: 150px;
top: 150px;
width: 100px;
height: 50px;
background-color: coral;
anchor-name: --a;
}
#target, #ref {
position: absolute;
left: 450px; /* force fallback */
width: 40px;
height: 40px;
background-color: skyblue;
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>
// Verify that a given try-tactic + untransformed declaration equals
// a reference element using `transformed` directly.
function test_anchor_flip(try_tactic, untransformed, transformed) {
test((t) => {
style.textContent = `
@position-try --pf {
inset: auto;
${untransformed}
}
#target {
position-try-options: --pf ${try_tactic};
}
@position-try --ref {
inset: auto;
${transformed}
}
#ref {
position-try-options: --ref;
}
`;
assert_equals(target.offsetLeft, ref.offsetLeft, 'offsetLeft');
assert_equals(target.offsetTop, ref.offsetTop, 'offsetTop');
}, `${try_tactic}, ${untransformed}, ${transformed}`);
}
test_anchor_flip('', 'left:anchor(0%)', 'left:anchor(left)');
test_anchor_flip('', 'left:anchor(100%)', 'left:anchor(right)');
test_anchor_flip('', 'left:anchor(50%)', 'left:anchor(center)');
test_anchor_flip('', 'top:anchor(0%)', 'top:anchor(top)');
test_anchor_flip('', 'top:anchor(100%)', 'top:anchor(bottom)');
test_anchor_flip('', 'top:anchor(50%)', 'top:anchor(center)');
test_anchor_flip('flip-inline', 'left:anchor(10%)', 'right:anchor(90%)');
test_anchor_flip('flip-inline', 'left:anchor(calc(10% + 20%))', 'right:anchor(70%)');
test_anchor_flip('flip-block', 'left:anchor(0%)', 'left:anchor(0%)');
test_anchor_flip('flip-block', 'left:anchor(100%)', 'left:anchor(100%)');
test_anchor_flip('flip-block', 'top:anchor(0%)', 'bottom:anchor(100%)');
test_anchor_flip('flip-block', 'top:anchor(100%)', 'bottom:anchor(0%)');
test_anchor_flip('flip-inline', 'left:anchor(0%)', 'right:anchor(100%)');
test_anchor_flip('flip-inline', 'left:anchor(100%)', 'right:anchor(0%)');
test_anchor_flip('flip-inline', 'top:anchor(0%)', 'top:anchor(0%)');
test_anchor_flip('flip-inline', 'top:anchor(100%)', 'top:anchor(100%)');
test_anchor_flip('flip-block flip-inline', 'left:anchor(0%)', 'right:anchor(100%)');
test_anchor_flip('flip-block flip-inline', 'left:anchor(100%)', 'right:anchor(0%)');
test_anchor_flip('flip-block flip-inline', 'top:anchor(0%)', 'bottom:anchor(100%)');
test_anchor_flip('flip-block flip-inline', 'top:anchor(100%)', 'bottom:anchor(0%)');
test_anchor_flip('flip-start', 'left:anchor(0%)', 'top:anchor(0%)');
test_anchor_flip('flip-start', 'left:anchor(100%)', 'top:anchor(100%)');
test_anchor_flip('flip-start', 'bottom:anchor(0%)', 'right:anchor(0%)');
test_anchor_flip('flip-start', 'bottom:anchor(100%)', 'right:anchor(100%)');
test_anchor_flip('flip-block flip-start', 'left:anchor(0%)', 'top:anchor(0%)');
test_anchor_flip('flip-block flip-start', 'left:anchor(100%)', 'top:anchor(100%)');
test_anchor_flip('flip-block flip-start', 'bottom:anchor(0%)', 'left:anchor(100%)');
test_anchor_flip('flip-block flip-start', 'bottom:anchor(100%)', 'left:anchor(0%)');
test_anchor_flip('flip-inline flip-start', 'left:anchor(0%)', 'bottom:anchor(100%)');
test_anchor_flip('flip-inline flip-start', 'left:anchor(100%)', 'bottom:anchor(0%)');
test_anchor_flip('flip-inline flip-start', 'bottom:anchor(0%)', 'right:anchor(0%)');
test_anchor_flip('flip-inline flip-start', 'bottom:anchor(100%)', 'right:anchor(100%)');
test_anchor_flip('flip-block flip-inline flip-start', 'left:anchor(0%)', 'bottom:anchor(100%)');
test_anchor_flip('flip-block flip-inline flip-start', 'left:anchor(100%)', 'bottom:anchor(0%)');
test_anchor_flip('flip-block flip-inline flip-start', 'bottom:anchor(0%)', 'left:anchor(100%)');
test_anchor_flip('flip-block flip-inline flip-start', 'bottom:anchor(100%)', 'left:anchor(0%)');
</script>
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