| <!DOCTYPE html> |
| <script src="../../resources/testharness.js"></script> |
| <script src="../../resources/testharnessreport.js"></script> |
| <style> |
| #target { |
| --static: 100; |
| } |
| </style> |
| <div id="target"></div> |
| <script> |
| setup(() => { |
| for (let name of ['--test', '--static', '--animated']) { |
| CSS.registerProperty({ |
| name, |
| syntax: '<number>', |
| initialValue: '0', |
| inherits: false, |
| }); |
| } |
| }); |
| |
| test(() => { |
| // --test is animating from a static value to an animated value resulting in it changing quadratically. |
| let animation = target.animate({'--test': ['var(--static)', 'var(--animated)']}, 100); |
| let referencedAnimation = target.animate({'--animated': ['200', '300']}, 100); |
| |
| referencedAnimation.currentTime = 25; |
| { |
| animation.currentTime = 25; |
| // lerp(100, lerp(200, 300, 25%), 25%) == 0.75*100 + 0.25*(0.75*200 + 0.25*300) == 131.25 |
| assert_equals(getComputedStyle(target).getPropertyValue('--test'), '131.25', 'target at 25%, to at 25%'); |
| |
| animation.currentTime = 75; |
| // lerp(100, lerp(200, 300, 25%), 75%) == 0.25*100 + 0.75*(0.75*200 + 0.25*300) == 193.75 |
| assert_equals(getComputedStyle(target).getPropertyValue('--test'), '193.75', 'target at 75%, to at 25%'); |
| } |
| |
| referencedAnimation.currentTime = 75; |
| { |
| animation.currentTime = 25; |
| // lerp(100, lerp(200, 300, 75%), 25%) == 0.75*100 + 0.25*(0.25*200 + 0.75*300) == 143.75 |
| assert_equals(getComputedStyle(target).getPropertyValue('--test'), '143.75', 'target at 25%, to at 25%'); |
| |
| animation.currentTime = 75; |
| // lerp(100, lerp(200, 300, 75%), 75%) == 0.25*100 + 0.75*(0.25*200 + 0.75*300) == 231.25 |
| assert_equals(getComputedStyle(target).getPropertyValue('--test'), '231.25', 'target at 75%, to at 25%'); |
| } |
| }, 'Animated registered custom properties can var() reference other animated registered custom properties across separate Animations.'); |
| </script> |
