| <!DOCTYPE html> |
| <html id="top"> |
| <meta charset="utf-8"> |
| <title>View timeline nested subject</title> |
| <link rel="help" href="https://drafts.csswg.org/scroll-animations-1/#viewtimeline-interface"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/web-animations/testcommon.js"></script> |
| <script src="/scroll-animations/scroll-timelines/testcommon.js"></script> |
| <script src="/scroll-animations/view-timelines/testcommon.js"></script> |
| <style type="text/css"> |
| #container { |
| overflow-y: scroll; |
| height: 300px; |
| width: 300px; |
| } |
| .big-spacer { |
| height: 800px; |
| } |
| .small-spacer { |
| height: 100px; |
| } |
| #block { |
| background-color: #ddd; |
| } |
| #target { |
| background-color: green; |
| height: 100px; |
| width: 100px; |
| } |
| </style> |
| <body> |
| <div id="container"> |
| <div class="big-spacer"></div> |
| <div id="block"> |
| <div class="small-spacer"></div> |
| <div id="target"></div> |
| </div> |
| <div class="big-spacer"></div> |
| </div> |
| </body> |
| <script type="text/javascript"> |
| promise_test(async t => { |
| container.scrollTop = 0; |
| await waitForNextFrame(); |
| |
| const anim = CreateViewTimelineOpacityAnimation(t, target); |
| const timeline = anim.timeline; |
| await anim.ready; |
| |
| // start offset = 800 + 100 - 300 = 600 |
| // end offset = 800 + 100 + 100 = 1000 |
| // scroll limit = L = 800 + 200 + 800 - 300 = 1500 |
| // progress = P = (current - start) / (end - start) |
| // P(0) = -600 / 400 = -1.5 |
| // P(L) = 900 / 400 = 2.5 |
| |
| // Initially before start-offset and animation effect is in the before |
| // phase. |
| assert_percents_equal(timeline.currentTime, -150, |
| "Timeline's currentTime at container start boundary"); |
| assert_percents_equal(anim.currentTime, -150, |
| "Animation's currentTime at container start boundary"); |
| assert_equals(getComputedStyle(target).opacity, "1", |
| 'Effect is inactive in the before phase'); |
| |
| |
| // Advance to the start offset, which triggers entry to the active phase. |
| container.scrollTop = 600; |
| await waitForNextFrame(); |
| assert_percents_equal(timeline.currentTime, 0, |
| "Timeline's current time at start offset"); |
| assert_percents_equal(anim.currentTime, 0, |
| "Animation's current time at start offset"); |
| assert_equals(getComputedStyle(target).opacity, '0.3', |
| 'Effect at the start of the active phase'); |
| |
| // Advance to the midpoint of the animation. |
| container.scrollTop = 800; |
| await waitForNextFrame(); |
| assert_percents_equal(timeline.currentTime, 50, |
| "Timeline's currentTime at midpoint"); |
| assert_percents_equal(anim.currentTime, 50, |
| "Animation's currentTime at midpoint"); |
| assert_equals(getComputedStyle(target).opacity,'0.5', |
| 'Effect at the midpoint of the active range'); |
| |
| // Advance to the end of the animation. |
| container.scrollTop = 1000; |
| await waitForNextFrame(); |
| assert_percents_equal(timeline.currentTime, 100, |
| "Timeline's currentTime at end offset"); |
| assert_percents_equal(anim.currentTime, 100, |
| "Animation's currentTime at end offset"); |
| assert_equals(getComputedStyle(target).opacity, '0.7', |
| 'Effect is in the after phase at effect end time'); |
| |
| // Advance to the scroll limit. |
| container.scrollTop = 1600; |
| await waitForNextFrame(); |
| assert_percents_equal(timeline.currentTime, 225, |
| "Timeline's currentTime at scroll limit"); |
| // Hold time set when the animation finishes, which clamps the value of |
| // the animation's currentTime. |
| assert_percents_equal(anim.currentTime, 100, |
| "Animation's currentTime at scroll limit"); |
| // In the after phase, so the effect should not be applied. |
| assert_equals(getComputedStyle(target).opacity, '1', |
| 'After phase at scroll limit'); |
| }, 'View timeline with subject that is not a direct descendant of the ' + |
| 'scroll container'); |
| </script> |
| </html> |
