68 lines
1.6 KiB
HTML
68 lines
1.6 KiB
HTML
<!DOCTYPE html>
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<title>CSS Anchor Positioning: Transition to a flipped state</title>
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<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#fallback-apply">
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<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#typedef-position-try-fallbacks-try-tactic">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<style>
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#cb {
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display: inline-block;
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position: relative;
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width: 400px;
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height: 250px;
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border: 1px solid black;
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}
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#cb.shrink {
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width: 325px;
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}
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#anchor {
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position: absolute;
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width: 50px;
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height: 50px;
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background: coral;
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left: 250px;
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top: 50px;
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anchor-name: --a;
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}
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#target {
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position-anchor: --a;
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position: absolute;
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left: anchor(right);
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top: anchor(top);
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width: 50px;
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height: 50px;
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background: skyblue;
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position-try-fallbacks: flip-start;
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}
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#target.anim {
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transition: left 1000s steps(2, start);
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}
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</style>
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<div id=cb>
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<div id=anchor></div>
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<div id=target></div>
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</div>
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<script>
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function cleanup() {
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target.className = '';
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cb.className = '';
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}
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test((t) => {
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t.add_cleanup(cleanup);
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assert_equals(target.offsetLeft, 300);
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cb.classList.add('shrink');
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target.classList.add('anim');
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assert_equals(target.offsetLeft, 275);
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}, 'Transition to a flipped state');
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test((t) => {
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t.add_cleanup(cleanup);
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cb.classList.add('shrink');
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assert_equals(target.offsetLeft, 250);
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cb.classList.remove('shrink');
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target.classList.add('anim');
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assert_equals(target.offsetLeft, 275);
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}, 'Transition to an unflipped state');
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</script>
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