| <!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> |
