<!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(() => {
  target.style.transform = 'translate(50%, 50%)';
  assert_equals(getComputedStyle(target).transform, 'matrix(1, 0, 0, 1, 50, 100)');
  target.style.transform = 'translate3D(50%, 50%, 100px)';
  assert_equals(getComputedStyle(target).transform, 'matrix3d(1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 50, 100, 50, 1)');
}, 'Retargeting transitions on box size relative transitions should work.');
</script>