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