| <!DOCTYPE html> |
| <title>CSS Animations: revert-rule in keyframes, dynamic</title> |
| <link rel="help" href="https://drafts.csswg.org/css-cascade-5/#revert-rule-keyword"> |
| <link rel="help" href="https://drafts.csswg.org/css-animations/"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <style> |
| @property --x { |
| syntax: "<length>"; |
| inherits: false; |
| initial-value: 0px; |
| } |
| @keyframes anim { |
| from { width: revert-rule; } |
| to { width: 200px; } |
| } |
| @keyframes anim-custom { |
| from { --x: revert-rule; } |
| to { --x: 200px; } |
| } |
| #target { |
| width: 100px; |
| --x: 100px; |
| animation: anim 3600s steps(2, start), |
| anim-custom 3600s steps(2, start); |
| } |
| </style> |
| <div id=target></div> |
| <script> |
| test((t) => { |
| t.add_cleanup(() => { target.style = ''; }); |
| assert_true(CSS.supports('color', 'revert-rule')); |
| assert_equals(getComputedStyle(target).width, '150px'); |
| target.style.setProperty('width', '120px'); |
| assert_equals(getComputedStyle(target).width, '160px'); |
| }, 'revert-rule in keyframes, reverted-to value changing (standard property)'); |
| |
| test((t) => { |
| t.add_cleanup(() => { target.style = ''; }); |
| assert_true(CSS.supports('color', 'revert-rule')); |
| assert_equals(getComputedStyle(target).getPropertyValue('--x'), '150px'); |
| target.style.setProperty('--x', '120px'); |
| assert_equals(getComputedStyle(target).getPropertyValue('--x'), '160px'); |
| }, 'revert-rule in keyframes, reverted-to value changing (custom property)'); |
| </script> |
