| <!DOCTYPE html> |
| <title>CSS Conditional Test: @container anchored(fallback) changes display type</title> |
| <link rel="help" href="https://drafts.csswg.org/css-anchor-position-2/#anchored-container-queries"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/css/css-conditional/container-queries/support/cq-testcommon.js"></script> |
| <style> |
| body { margin: 0; } |
| #anchor { |
| anchor-name: --a; |
| margin-top: 100px; |
| width: 100px; |
| height: 100px; |
| } |
| #anchored { |
| position: absolute; |
| position-anchor: --a; |
| position-area: top; |
| position-try-fallbacks: flip-block; |
| width: 100px; |
| height: 100px; |
| container-type: anchored; |
| } |
| #t1 { height: 100%; } |
| @container anchored(fallback: none) { |
| #t1 { display: none; } |
| } |
| @container anchored(fallback: flip-block) { |
| #t1 { display: block; } |
| } |
| </style> |
| <div id="anchor"></div> |
| <div id="anchored"> |
| <span id="t1"></span> |
| </div> |
| <script> |
| test(() => { |
| assert_equals(anchored.offsetTop, 0, "Non-fallback rendering"); |
| assert_equals(t1.offsetHeight, 0, "display:none - zero offsetHeight"); |
| }, "@container anchored() without applied fallback"); |
| |
| test(() => { |
| anchor.style.marginTop = "50px"; // Trigger fallback |
| assert_equals(anchored.offsetTop, 150, "Anchored element rendered below anchor"); |
| assert_equals(t1.offsetHeight, 100, "Fallback applies display:block"); |
| }, "@container anchored() with fallback applied"); |
| </script> |
