| <!DOCTYPE html> |
| <title>CSS Anchor Positioning: <'position-area'> value</title> |
| <link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#position-try-fallbacks"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <style> |
| #cb { |
| position: relative; |
| width: 200px; |
| height: 200px; |
| border: 1px solid black; |
| } |
| #anchor { |
| position: absolute; |
| left: 100px; |
| top: 100px; |
| width: 80px; |
| height: 80px; |
| background-color: tomato; |
| anchor-name: --a; |
| } |
| #target, #ref { |
| position: absolute; |
| width: 40px; |
| height: 40px; |
| background-color: skyblue; |
| position-area: bottom right; |
| position-anchor: --a; |
| } |
| #ref { |
| background-color: seagreen; |
| } |
| </style> |
| <style id=style> |
| </style> |
| <div id=cb> |
| <div id=anchor></div> |
| <div id=target></div> |
| <div id=ref></div> |
| </div> |
| <script> |
| |
| // Test that a given <'position-area'> produces the same result as a reference |
| // element that is styled with an position-area declaration directly. |
| function test_position_area_fn(position_area) { |
| test((t) => { |
| t.add_cleanup(() => { |
| style.textContent = ''; |
| }); |
| style.textContent = ` |
| #target { |
| position-try-fallbacks: ${position_area}; |
| } |
| #ref { |
| position-area: ${position_area}; |
| } |
| `; |
| assert_equals(target.offsetLeft, ref.offsetLeft, 'offsetLeft'); |
| assert_equals(target.offsetTop, ref.offsetTop, 'offsetTop'); |
| }, `${position_area}`); |
| } |
| |
| test_position_area_fn('top left'); |
| test_position_area_fn('span-top left'); |
| test_position_area_fn('top span-left'); |
| test_position_area_fn('top center'); |
| test_position_area_fn('left center'); |
| test_position_area_fn('start center'); |
| test_position_area_fn('center start'); |
| |
| </script> |
