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diff --git a/testing/web-platform/tests/web-animations/animation-model/keyframe-effects/effect-value-overlapping-keyframes.html b/testing/web-platform/tests/web-animations/animation-model/keyframe-effects/effect-value-overlapping-keyframes.html new file mode 100644 index 0000000000..a2a0683921 --- /dev/null +++ b/testing/web-platform/tests/web-animations/animation-model/keyframe-effects/effect-value-overlapping-keyframes.html @@ -0,0 +1,77 @@ +<!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> |