| <!DOCTYPE html> |
| <link rel=author href="mailto:graouts@webkit.org"> |
| <link rel=help href="https://drafts.csswg.org/css-animations/#animations"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/css/css-animations/support/testcommon.js"></script> |
| <style> |
| @keyframes margin { |
| 100% { margin-left: 200px } |
| } |
| |
| #child { |
| animation: margin 1s forwards; |
| } |
| </style> |
| <div id="container"> |
| <div> |
| <div id="child"></div> |
| </div> |
| </div> |
| <script> |
| test(() => { |
| const container = document.getElementById("container"); |
| const animationCount = () => container.getAnimations({ subtree: true }).length; |
| |
| assert_equals(animationCount(), 1, `An animation is running on the child initially with "display: block" on the container.`); |
| |
| container.style.display = "none"; |
| assert_equals(animationCount(), 0, `Setting "display: none" on the container canceled the animation.`); |
| |
| container.style.marginLeft = "50px"; |
| container.firstElementChild.style.marginLeft = "100px"; |
| assert_equals(animationCount(), 0, `Manipulating styles on the container and a child element does not restart the animation.`); |
| }, 'Elements in a "display: none" tree cannot start CSS Animations.'); |
| </script> |
