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+<!doctype html>
+<meta charset=utf-8>
+<title>KeyframeEffect.setKeyframes() for CSS animations</title>
+<!-- TODO: Add a more specific link for this once it is specified. -->
+<link rel="help" href="https://drafts.csswg.org/css-animations-2/">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="support/testcommon.js"></script>
+<style>
+@keyframes anim-simple {
+ from { left: 0px }
+ to { left: 100px }
+}
+</style>
+<body>
+<div id="log"></div>
+<script>
+"use strict";
+
+// Note that the sanity check that getKeyframes() normally DOES return the
+// updated keyframes is contained in KeyframeEffect-getKeyframes.html.
+test(t => {
+ const div = addDiv(t);
+
+ // Add custom @keyframes rule
+ const stylesheet = document.styleSheets[0];
+ const keyframes = '@keyframes anim-custom { to { left: 100px } }';
+ const ruleIndex = stylesheet.insertRule(keyframes, 0);
+ const keyframesRule = stylesheet.cssRules[ruleIndex];
+
+ t.add_cleanup(function() {
+ stylesheet.deleteRule(ruleIndex);
+ });
+
+ div.style.animation = 'anim-custom 100s';
+
+ // Update the keyframes via the API
+ const animation = div.getAnimations()[0];
+ animation.effect.setKeyframes({ left: '200px' });
+
+ // Then update them via style
+ keyframesRule.deleteRule(0);
+ keyframesRule.appendRule('to { left: 300px }');
+
+ // The result should be the keyframes as set by the API, not via style.
+ const frames = animation.effect.getKeyframes();
+ assert_frames_equal(
+ frames[frames.length - 1],
+ {
+ offset: null,
+ computedOffset: 1,
+ easing: 'linear',
+ composite: 'auto',
+ left: '200px',
+ },
+ 'Keyframes reflect the value set via setKeyframes'
+ );
+}, 'KeyframeEffect.setKeyframes() causes subsequent changes to @keyframes'
+ + ' rules to be ignored');
+
+test(t => {
+ const div = addDiv(t);
+ div.style.animation = 'anim-simple 100s';
+
+ const animation = div.getAnimations()[0];
+ assert_equals(animation.effect.getKeyframes()[0].easing, 'ease');
+
+ animation.effect.setKeyframes({ left: ['200px', '300px'] });
+ assert_equals(animation.effect.getKeyframes()[0].easing, 'linear');
+
+ div.style.animationTimingFunction = 'ease-in';
+ getComputedStyle(div).animationTimingFunction;
+
+ assert_equals(
+ animation.effect.getKeyframes()[0].easing,
+ 'linear',
+ 'Easing should be the easing set by the API'
+ );
+}, 'KeyframeEffect.setKeyframes() causes subsequent changes to'
+ + ' animation-timing-function to be ignored');
+
+test(t => {
+ const div = addDiv(t);
+
+ const stylesheet = document.styleSheets[0];
+ const keyframes = '@keyframes anim-custom { to { left: 100px } }';
+ const ruleIndex = stylesheet.insertRule(keyframes, 0);
+ const keyframesRule = stylesheet.cssRules[ruleIndex];
+
+ t.add_cleanup(function() {
+ stylesheet.deleteRule(ruleIndex);
+ });
+
+ div.style.animation = 'anim-custom 100s';
+
+ // Try updating in a way that throws an error
+ const animation = div.getAnimations()[0];
+ assert_throws_js(TypeError, () => {
+ animation.effect.setKeyframes({ left: '200px', offset: 'yer' });
+ });
+
+ keyframesRule.deleteRule(0);
+ keyframesRule.appendRule('to { left: 300px }');
+
+ // The result should be the keyframes as set via style.
+ const frames = animation.effect.getKeyframes();
+ assert_frames_equal(
+ frames[frames.length - 1],
+ {
+ offset: 1,
+ computedOffset: 1,
+ easing: 'ease',
+ composite: 'auto',
+ left: '300px',
+ },
+ 'Keyframes reflect the value set via style'
+ );
+}, 'KeyframeEffect.setKeyframes() should NOT cause subsequent changes to'
+ + ' @keyframes rules to be ignored if it threw');
+
+</script>
+</body>