<!doctype html> <meta charset=utf-8> <title>KeyframeEffect.setKeyframes() for CSS transitions</title> <!-- TODO: Add a more specific link for this once it is specified. --> <link rel="help" href="https://drafts.csswg.org/css-transitions-2/#csstransition"> <script src="/resources/testharness.js"></script> <script src="/resources/testharnessreport.js"></script> <script src="support/helper.js"></script> <div id="log"></div> <script> 'use strict'; test(t => { const div = addDiv(t); div.style.left = '0px'; getComputedStyle(div).transitionProperty; div.style.transition = 'left 100s'; div.style.left = '100px'; const transition = div.getAnimations()[0]; transition.effect.setKeyframes({ left: ['200px', '300px', '100px'] }); assert_equals(getComputedStyle(div).left, '200px'); }, 'Keyframes set using setKeyframes() are reflected in computed style for' + ' a running transition'); test(t => { const div = addDiv(t); div.style.left = '0px'; getComputedStyle(div).transitionProperty; div.style.transition = 'left 100s'; div.style.left = '100px'; const transition = div.getAnimations()[0]; transition.effect.setKeyframes({ top: ['0px', '100px', '300px'] }); assert_equals(transition.transitionProperty, 'left'); }, 'A transition with replaced keyframes still returns the original' + ' transitionProperty'); test(t => { const div = addDiv(t); div.style.left = '0px'; getComputedStyle(div).transitionProperty; div.style.transition = 'left 100s'; div.style.left = '100px'; const transition = div.getAnimations()[0]; transition.effect.setKeyframes({ }); assert_equals(transition.transitionProperty, 'left'); }, 'A transition with no keyframes still returns the original' + ' transitionProperty'); function retarget_test(description, newKeyframes, reversed_start) { test(t => { const div = addDiv(t); div.style.left = '0px'; getComputedStyle(div).transitionProperty; div.style.transition = 'left 100s linear'; div.style.left = '100px'; const transition = div.getAnimations()[0]; transition.currentTime = 50 * MS_PER_SEC; transition.effect.setKeyframes(newKeyframes); // Reverse transition div.style.left = '0px'; const reversedTransition = div.getAnimations()[0]; assert_approx_equals( reversedTransition.effect.getComputedTiming().activeDuration, 50 * MS_PER_SEC, 1, "The reversed transition has correctly reduced duration" ); assert_equals(reversedTransition.effect.getKeyframes()[0].left, reversed_start, "The reversed transition starts at the expected point"); }, description); } retarget_test("A transition with replaced keyframes animating the same property " + "still exhibits normal reversing behavior.", {left: ['200px', '300px', '100px']}, '300px'); retarget_test("A transition with replaced keyframes animating a different property " + "still exhibits normal reversing behavior (reversing from the base value).", {top: ['200px', '300px', '100px']}, '100px'); retarget_test("A transition with replaced keyframes animating nothing " + "still exhibits normal reversing behavior (reversing from the base value).", {}, '100px'); test(t => { const div = addDiv(t); // Initialize the style. div.style.left = '100px'; div.style.top = '100px'; div.style.transition = 'left 100s linear, top 100s linear'; getComputedStyle(div).left; // Start some transitions. div.style.left ='200px'; div.style.top = '200px'; const transitions = div.getAnimations(); // Hand control of the left property over to top's transition. The composite // ordering of the animations is 'left' then 'top' since the transitions were // generated in the same transition generation and follow Unicode ordering. assert_equals(transitions[0].transitionProperty, 'left'); transitions[0].effect.setKeyframes({}); transitions[1].effect.setKeyframes([ {left: '100px', top: '100px'}, {left: '400px', top: '200px'}]) getComputedStyle(div).left; // These updates form a single style change, equivalent to setting times and // then setting left. transitions[0].currentTime = 50 * MS_PER_SEC; div.style.left ='100px'; transitions[1].currentTime = 60 * MS_PER_SEC; // As there was a style change event, the new 'left' transition now has a // higher value for the transition generation than the 'top' transition, // reversing the order of the transitions returned by getAnimations. const reversedTransition = div.getAnimations()[1]; assert_equals(reversedTransition.transitionProperty, 'left', "A reversed transition on left is produced"); assert_approx_equals( reversedTransition.effect.getComputedTiming().activeDuration, 50 * MS_PER_SEC, 1, "The reversed transition has correctly reduced duration (based on the " + "original left transition)."); assert_equals(reversedTransition.effect.getKeyframes()[0].left, '280px', "The reversed transition gets its start value from the other " + "transition controlling left"); }, "A transition with replaced keyframes animating nothing on a property " + "being controlled by another modified transition exhibits normal " + "reversing behavior and reverses from the other transition's current " + "value."); test(t => { const div = addDiv(t); // Initialize the style. div.style.left = '100px'; div.style.transition = 'left 100s linear'; getComputedStyle(div).left; // Start the transtion. div.style.left ='200px'; const transition = div.getAnimations()[0]; // Update the keyframes and advance to the midpoint of the animation. transition.effect.setKeyframes([ { offset: 0, left: '-50px', composite: 'add', easing: 'linear'}]); transition.currentTime = 50 * MS_PER_SEC; assert_equals(getComputedStyle(div).left, '175px', 'The computed style is based on the updated keyframes'); div.style.left = '100px'; const reversedTransition = div.getAnimations()[0]; assert_equals(reversedTransition.effect.getKeyframes()[0].left, '175px', 'The start value matches the \'before change\' value'); }, 'A transition with replaced kefyrames and composite \'add\' exhibits ' + 'normal reversing behavior, and the effect is not double counted when ' + 'calculating the before change style'); </script>