| <!DOCTYPE html> |
| <meta charset="utf-8"> |
| <title>CSS Cascade: 'revert' keyword in transition</title> |
| <link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io"> |
| <link rel="author" title="Mozilla" href="https://mozilla.org"> |
| <link rel="help" href="https://drafts.csswg.org/css-cascade/#default"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <style> |
| html, body { margin: 0 } |
| h1 { |
| margin: 0; |
| transition: margin 10s; |
| transition-delay: -5s; /* So we can expect it to be half-way the transition when toggling the property */ |
| } |
| </style> |
| <h1>This is a header that should get some margin</h1> |
| <script> |
| test(function() { |
| const el = document.querySelector("h1"); |
| const cs = getComputedStyle(el); |
| assert_equals(cs.marginTop, "0px", "Margin before transition"); |
| el.style.margin = "revert"; |
| const midTransition = cs.marginTop; |
| assert_not_equals(midTransition, "0px", "Margin mid transition"); |
| el.style.transition = "none"; |
| assert_not_equals(cs.marginTop, midTransition, "Default margin"); |
| }, "revert works with transitions"); |
| </script> |