| <!DOCTYPE html> |
| <title>Tests CSS transition of anchor() across tree scopes</title> |
| <link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/"> |
| <link rel="help" href="https://github.com/w3c/csswg-drafts/issues/8180"></script> |
| <link rel="author" href="mailto:xiaochengh@chromium.org"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| |
| <style> |
| body { |
| margin: 0; |
| } |
| |
| #anchor1 { |
| width: 100px; |
| height: 100px; |
| background: orange; |
| anchor-name: --a; |
| } |
| |
| #anchor2 { |
| width: 100px; |
| height: 100px; |
| margin-top: 200px; |
| margin-left: 300px; |
| background: orange; |
| } |
| |
| #anchor2.after::part(target) { |
| top: anchor(--a top); |
| left: anchor(--a right); |
| } |
| </style> |
| |
| <div id="anchor1"></div> |
| <div id="anchor2"></div> |
| |
| <script> |
| setup(() => { |
| let shadow = anchor2.attachShadow({mode: 'open'}); |
| shadow.innerHTML = ` |
| <style> |
| :host { anchor-name: --a; } |
| #target { |
| position: fixed; |
| width: 100px; |
| height: 100px; |
| background: lime; |
| top: anchor(--a top); |
| left: anchor(--a right); |
| transition: all 10s -5s linear; |
| } |
| </style> |
| <div id="target" part="target"></div> |
| `; |
| }); |
| |
| test(() => { |
| let target = anchor2.shadowRoot.getElementById('target'); |
| |
| // Forces layout |
| target.offsetLeft; |
| |
| // Triggers a transition from using #anchor2 to using #anchor1, |
| // starting immediately at 50% progress. |
| anchor2.classList.add('after'); |
| assert_equals(target.offsetLeft, 250); |
| assert_equals(target.offsetTop, 150); |
| }, 'Transition with anchor names defined in different tree scopes'); |
| </script> |
