| <!DOCTYPE html> |
| <title>anchor-name only applies to elements which generate a principal box</title> |
| <link rel="help" href="https://drafts.csswg.org/css-anchor-1/#target-anchor-element"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <style> |
| body { margin-top: 0; } |
| #outer { |
| anchor-name: --anchor; |
| display: contents; |
| } |
| #inner { |
| anchor-name: --anchor; |
| } |
| #filler { |
| height: 100px; |
| } |
| #anchored { |
| position: absolute; |
| top: anchor(--anchor top); |
| } |
| </style> |
| <div id="outer"> |
| <div id="filler"></div> |
| <div id="inner"></div> |
| </div> |
| <div id="anchored"></div> |
| <script> |
| test(() => { |
| assert_equals(anchored.offsetTop, 100, "#anchored is positioned against #inner"); |
| }, "anchor-name should only apply to elements which generate a principal box"); |
| </script> |
