| <!DOCTYPE html> |
| <title>CSS Values and Units Test: sibling-index() changing length value during @keyframes animation</title> |
| <link rel="help" href="https://drafts.csswg.org/css-values-5/#tree-counting"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <style> |
| @keyframes --anim { |
| from { |
| top: calc(100px * sibling-index()); |
| } |
| to { |
| top: 0px; |
| } |
| } |
| #target { |
| animation: --anim 1000s step-end; |
| position: absolute; |
| top: 13px; |
| width: 100px; |
| height: 100px; |
| } |
| </style> |
| <div> |
| <div id="rm"></div> |
| <div id="target"></div> |
| </div> |
| <script> |
| test(() => { |
| assert_equals(getComputedStyle(target).top, "200px"); |
| }, "Initially, the sibling-index() is 2 for #target"); |
| |
| test(() => { |
| rm.remove(); |
| assert_equals(getComputedStyle(target).top, "100px"); |
| }, "Removing a preceding sibling of #target reduces the sibling-index()"); |
| |
| </script> |
