| <!DOCTYPE html> |
| <title>Tests CSS transition of anchor() and anchor-size() functions</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 { |
| margin-left: 0px; |
| margin-top: 0px; |
| width: 200px; |
| height: 100px; |
| background: orange; |
| anchor-name: --a1; |
| } |
| |
| #anchor2 { |
| margin-left: 400px; |
| margin-top: 200px; |
| width: 100px; |
| height: 200px; |
| background: orange; |
| anchor-name: --a2; |
| } |
| |
| #target { |
| position: fixed; |
| width: 100px; |
| height: 100px; |
| background-color: lime; |
| transition: all 10s -5s linear; |
| } |
| |
| #target.before { |
| top: anchor(--a1 top); |
| left: anchor(--a1 right); |
| width: anchor-size(--a1 width); |
| height: anchor-size(--a1 height); |
| } |
| |
| #target.after { |
| top: anchor(--a2 bottom); |
| left: anchor(--a2 left); |
| width: anchor-size(--a2 width); |
| height: anchor-size(--a2 height); |
| } |
| </style> |
| |
| <div id="anchor1"></div> |
| <div id="anchor2"></div> |
| <div id="target" class="before"></div> |
| |
| <script> |
| setup(() => { |
| // Forces layout |
| target.offsetLeft; |
| // Triggers transition starting at 50% immediately |
| target.classList.remove('before'); |
| target.classList.add('after'); |
| }); |
| |
| test(() => { |
| assert_equals(target.offsetLeft, 300); |
| assert_equals(target.offsetTop, 250); |
| }, 'Transition of anchor() when changing target anchor element name'); |
| |
| test(() => { |
| assert_equals(target.offsetWidth, 150); |
| assert_equals(target.offsetHeight, 150); |
| }, 'Transition of anchor-size() when changing target anchor element name'); |
| </script> |
| |
