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73 lines
3.3 KiB
HTML
73 lines
3.3 KiB
HTML
<!DOCTYPE html>
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<meta charset=utf-8>
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<title>Effect value computation tests when keyframes overlap</title>
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<link rel="help" href="https://w3c.github.io/web-animations/#the-effect-value-of-a-keyframe-animation-effect">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="../../testcommon.js"></script>
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<body>
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<div id="log"></div>
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<div id="target"></div>
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<script>
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'use strict';
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test(function(t) {
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var div = createDiv(t);
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var anim = div.animate([ { offset: 0, opacity: 0 },
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{ offset: 0, opacity: 0.1 },
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{ offset: 0, opacity: 0.2 },
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{ offset: 1, opacity: 0.8 },
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{ offset: 1, opacity: 0.9 },
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{ offset: 1, opacity: 1 } ],
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{ duration: 1000,
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easing: 'cubic-bezier(0.5, -0.5, 0.5, 1.5)' });
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assert_equals(getComputedStyle(div).opacity, '0.2',
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'When progress is zero the last keyframe with offset 0 should'
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+ ' be used');
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// http://cubic-bezier.com/#.5,-0.5,.5,1.5
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// At t=0.15, the progress should be negative
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anim.currentTime = 150;
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assert_equals(getComputedStyle(div).opacity, '0',
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'When progress is negative, the first keyframe with a 0 offset'
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+ ' should be used');
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// At t=0.71, the progress should be just less than 1
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anim.currentTime = 710;
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assert_approx_equals(parseFloat(getComputedStyle(div).opacity), 0.8, 0.01,
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'When progress is just less than 1, the first keyframe with an'
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+ ' offset of 1 should be used as the interval endpoint');
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// At t=0.85, the progress should be > 1
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anim.currentTime = 850;
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assert_equals(getComputedStyle(div).opacity, '1',
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'When progress is greater than 1.0, the last keyframe with a 1'
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+ ' offset should be used');
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anim.finish();
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assert_equals(getComputedStyle(div).opacity, '1',
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'When progress is equal to 1.0, the last keyframe with a 1'
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+ ' offset should be used');
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}, 'Overlapping keyframes at 0 and 1 use the appropriate value when the'
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+ ' progress is outside the range [0, 1]');
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test(function(t) {
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var div = createDiv(t);
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var anim = div.animate([ { offset: 0, opacity: 0 },
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{ offset: 0.5, opacity: 0.3 },
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{ offset: 0.5, opacity: 0.5 },
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{ offset: 0.5, opacity: 0.7 },
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{ offset: 1, opacity: 1 } ], 1000);
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anim.currentTime = 250;
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assert_equals(getComputedStyle(div).opacity, '0.15',
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'Before the overlap point, the first keyframe from the'
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+ ' overlap point should be used as interval endpoint');
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anim.currentTime = 500;
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assert_equals(getComputedStyle(div).opacity, '0.7',
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'At the overlap point, the last keyframe from the'
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+ ' overlap point should be used as interval startpoint');
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anim.currentTime = 750;
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assert_equals(getComputedStyle(div).opacity, '0.85',
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'After the overlap point, the last keyframe from the'
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+ ' overlap point should be used as interval startpoint');
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}, 'Overlapping keyframes between 0 and 1 use the appropriate value on each'
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+ ' side of the overlap point');
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</script>
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</body>
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