Kiet Ho
815dc06640
Automatic update from web-platform-tests WebKit export of https://bugs.webkit.org/show_bug.cgi?id=295009 -- wpt-commits: 2d623bd1ab81ec5cc998ffd485860bdc14a61272 wpt-pr: 54345
65 lines
1.6 KiB
HTML
65 lines
1.6 KiB
HTML
<!DOCTYPE html>
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<title>CSS Anchor Positioning: Transition when @position-try is applied</title>
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<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#fallback-apply">
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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: 300px;
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}
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#target {
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position: absolute;
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left: 300px;
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width: 50px;
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height: 50px;
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background: skyblue;
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}
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#target.fallback {
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position-try-fallbacks: --200;
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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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@position-try --200 {
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left: 200px;
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}
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</style>
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<div id=cb>
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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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// Clean up running transition
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target.getAnimations().forEach(a => a.cancel());
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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('fallback', 'anim');
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// Now we take the --200 fallback:
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assert_equals(target.offsetLeft, 250);
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}, 'Transition when @position-try is applied');
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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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target.classList.add('fallback');
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assert_equals(target.offsetLeft, 200);
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cb.classList.remove('shrink');
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target.classList.remove('fallback');
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target.classList.add('anim');
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assert_equals(target.offsetLeft, 250);
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}, 'Transition when @position-try is unapplied');
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</script>
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