31 lines
1.3 KiB
HTML
31 lines
1.3 KiB
HTML
<!DOCTYPE html>
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<link rel=help href="https://bugs.chromium.org/p/chromium/issues/detail?id=571437">
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<link rel=help href="https://drafts.csswg.org/css-transforms-2/#interpolation-of-transform-functions">
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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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#target {
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width: 100px;
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height: 200px;
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transition-properties: transform;
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transition-duration: 1s;
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transition-delay: -0.5s;
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transition-timing-function: linear;
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}
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</style>
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<div id="target"></div>
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<script>
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test(() => {
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// Force a style update ahead of the transform change.
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assert_equals(getComputedStyle(target).transform, 'none');
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target.style.transform = 'translate(50%, 50%)';
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// Ultimate target is 50, 100, which is half of width and height,
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// respectively. The translation puts us at the midpoint, which is at
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// (x, y) = (25, 50).
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assert_equals(getComputedStyle(target).transform, 'matrix(1, 0, 0, 1, 25, 50)');
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target.style.transform = 'translate3D(50%, 50%, 100px)';
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// After retargetting we preserve the progress between the current value and
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// and new target value.
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assert_equals(getComputedStyle(target).transform, 'matrix3d(1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 37.5, 75, 50, 1)');
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}, 'Retargeting transitions on box size relative transitions should work.');
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</script>
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