| <!doctype html> |
| <meta charset=utf-8> |
| <title>CSS Animations on a <dialog> ::backdrop</title> |
| <link rel="help" href="https://drafts.csswg.org/css-animations-1/"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="support/testcommon.js"></script> |
| <style> |
| |
| dialog[open]::backdrop { |
| animation: dialog-backdrop-animation 1ms; |
| } |
| |
| @keyframes dialog-backdrop-animation { |
| from { opacity: 0 } |
| } |
| |
| </style> |
| <div id="log"></div> |
| <script> |
| |
| "use strict"; |
| |
| promise_test(async t => { |
| const dialog = addElement(t, "dialog"); |
| |
| // Open the dialog a first time, this should trigger a CSS Animation. |
| dialog.showModal(); |
| const animations = dialog.getAnimations({ subtree: true }); |
| assert_equals(animations.length, 1, "As the <dialog> is shown intially an animation is started on its ::backdrop"); |
| |
| await animations[0].finished; |
| |
| await waitForNextFrame(); |
| |
| dialog.close(); |
| assert_equals(dialog.getAnimations({ subtree: true }).length, 0, "As the <dialog> is closed the animation is removed from its ::backdrop"); |
| |
| await waitForNextFrame(); |
| |
| dialog.showModal(); |
| assert_equals(dialog.getAnimations({ subtree: true }).length, 1, "As the <dialog> is shown again an animation is started again on its ::backdrop"); |
| }, "CSS Animations on a <dialog> ::backdrop are canceled and restarted as the dialog is hidden and shown"); |
| </script> |