| <!DOCTYPE html> |
| <title>CSS Anchor Positioning: position-area positioning - alignment</title> |
| <link rel="help" href="https://drafts.csswg.org/css-anchor-position/#position-area"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <style> |
| /* A 300x300 container with a 100x100 centered anchor */ |
| #container { |
| position: relative; |
| width: 300px; |
| height: 300px; |
| } |
| #anchor { |
| position: absolute; |
| top: 100px; |
| left: 100px; |
| width: 100px; |
| height: 100px; |
| anchor-name: --anchor; |
| } |
| #anchored { |
| position: absolute; |
| width: 10px; |
| height: 10px; |
| inset: 10px 15px 20px 25px; |
| position-anchor: --anchor; |
| } |
| </style> |
| <div id="container"> |
| <div id="anchor"></div> |
| <div id="anchored"></div> |
| </div> |
| <script> |
| function test_position_area(position_area, expected_offsets) { |
| anchored.style.positionArea = position_area; |
| |
| test(() => { |
| assert_equals(anchored.offsetLeft, expected_offsets.left, "Check expected offsetLeft"); |
| assert_equals(anchored.offsetTop, expected_offsets.top, "Check expected offsetTop"); |
| assert_equals(anchored.offsetWidth, expected_offsets.width, "Check expected offsetWidth"); |
| assert_equals(anchored.offsetHeight, expected_offsets.height, "Check expected offsetHeight"); |
| }, "Offsets for position-area: " + position_area); |
| } |
| |
| // anchor-center in both directions |
| test_position_area("span-all", {left:145, top:145, width:10, height:10}); |
| |
| // Single region spans |
| test_position_area("top left", {left:75, top:70, width:10, height:10}); |
| test_position_area("top center", {left:150, top:70, width:10, height:10}); |
| test_position_area("top right", {left:225, top:70, width:10, height:10}); |
| test_position_area("center left", {left:75, top:140, width:10, height:10}); |
| test_position_area("center center", {left:150, top:140, width:10, height:10}); |
| test_position_area("center right", {left:225, top:140, width:10, height:10}); |
| test_position_area("bottom left", {left:75, top:210, width:10, height:10}); |
| test_position_area("bottom center", {left:150, top:210, width:10, height:10}); |
| test_position_area("bottom right", {left:225, top:210, width:10, height:10}); |
| |
| // Multi-region spans |
| test_position_area("top span-left", {left:175, top:70, width:10, height:10}); |
| test_position_area("top span-right", {left:125, top:70, width:10, height:10}); |
| test_position_area("span-top left", {left:75, top:170, width:10, height:10}); |
| test_position_area("span-bottom left", {left:75, top:110, width:10, height:10}); |
| |
| </script> |
