| <!DOCTYPE html> |
| <script src="../../resources/testharness.js"></script> |
| <script src="../../resources/testharnessreport.js"></script> |
| <style> |
| @keyframes test { |
| to { --x: to; } |
| } |
| #target { |
| --x: underlying; |
| animation: test 1s; |
| } |
| </style> |
| <div id="target"></div> |
| <script> |
| CSS.registerProperty({ |
| name: '--x', |
| syntax: '*', |
| inherits: false, |
| }); |
| |
| test(() => { |
| target.style.animationDelay = '-0.25s'; |
| assert_equals(getComputedStyle(target).getPropertyValue('--x'), ' underlying', 'at 25%'); |
| |
| target.style.animationDelay = '-0.75s'; |
| assert_equals(getComputedStyle(target).getPropertyValue('--x'), ' to', 'at 25%'); |
| }, 'CSS Animations neutral keyframes on registered custom properties should produce the underlying value'); |
| </script> |
