| <!DOCTYPE html> |
| <meta charset=utf-8> |
| <title>The effect value of a keyframe effect: Overlapping keyframes</title> |
| <link rel="help" href="https://drafts.csswg.org/web-animations/#the-effect-value-of-a-keyframe-animation-effect"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="../../testcommon.js"></script> |
| <body> |
| <div id="log"></div> |
| <div id="target"></div> |
| <script> |
| 'use strict'; |
| |
| function assert_opacity_value(opacity, expected, description) { |
| return assert_approx_equals(parseFloat(opacity), expected, 0.0001, description); |
| } |
| |
| test(t => { |
| const div = createDiv(t); |
| const anim = div.animate([ { offset: 0, opacity: 0 }, |
| { offset: 0, opacity: 0.1 }, |
| { offset: 0, opacity: 0.2 }, |
| { offset: 1, opacity: 0.8 }, |
| { offset: 1, opacity: 0.9 }, |
| { offset: 1, opacity: 1 } ], |
| { duration: 1000, |
| easing: 'cubic-bezier(0.5, -0.5, 0.5, 1.5)' }); |
| assert_opacity_value(getComputedStyle(div).opacity, 0.2, |
| 'When progress is zero the last keyframe with offset 0 should' |
| + ' be used'); |
| // http://cubic-bezier.com/#.5,-0.5,.5,1.5 |
| // At t=0.15, the progress should be negative |
| anim.currentTime = 150; |
| assert_equals(getComputedStyle(div).opacity, '0', |
| 'When progress is negative, the first keyframe with a 0 offset' |
| + ' should be used'); |
| // At t=0.71, the progress should be just less than 1 |
| anim.currentTime = 710; |
| assert_approx_equals(parseFloat(getComputedStyle(div).opacity), 0.8, 0.01, |
| 'When progress is just less than 1, the first keyframe with an' |
| + ' offset of 1 should be used as the interval endpoint'); |
| // At t=0.85, the progress should be > 1 |
| anim.currentTime = 850; |
| assert_equals(getComputedStyle(div).opacity, '1', |
| 'When progress is greater than 1.0, the last keyframe with a 1' |
| + ' offset should be used'); |
| anim.finish(); |
| assert_equals(getComputedStyle(div).opacity, '1', |
| 'When progress is equal to 1.0, the last keyframe with a 1' |
| + ' offset should be used'); |
| }, 'Overlapping keyframes at 0 and 1 use the appropriate value when the' |
| + ' progress is outside the range [0, 1]'); |
| |
| test(t => { |
| const div = createDiv(t); |
| const anim = div.animate([ { offset: 0, opacity: 0 }, |
| { offset: 0.5, opacity: 0.3 }, |
| { offset: 0.5, opacity: 0.5 }, |
| { offset: 0.5, opacity: 0.7 }, |
| { offset: 1, opacity: 1 } ], 1000); |
| anim.currentTime = 250; |
| assert_opacity_value(getComputedStyle(div).opacity, 0.15, |
| 'Before the overlap point, the first keyframe from the' |
| + ' overlap point should be used as interval endpoint'); |
| anim.currentTime = 500; |
| assert_opacity_value(getComputedStyle(div).opacity, 0.7, |
| 'At the overlap point, the last keyframe from the' |
| + ' overlap point should be used as interval startpoint'); |
| anim.currentTime = 750; |
| assert_opacity_value(getComputedStyle(div).opacity, 0.85, |
| 'After the overlap point, the last keyframe from the' |
| + ' overlap point should be used as interval startpoint'); |
| }, 'Overlapping keyframes between 0 and 1 use the appropriate value on each' |
| + ' side of the overlap point'); |
| |
| </script> |
| </body> |