| <!DOCTYPE html> |
| <script src="../../../resources/testharness.js"></script> |
| <script src="../../../resources/testharnessreport.js"></script> |
| <style> |
| |
| body { margin: 0; } |
| .rel { position: relative; } |
| .abs { position: absolute; } |
| .fix { position: fixed; } |
| |
| </style> |
| <div class="rel"> |
| <div class="abs"> |
| <div class="fix">fixed</div> |
| </div> |
| </div> |
| <script> |
| |
| test(() => { |
| var abs = document.querySelector(".abs"); |
| var fix = document.querySelector(".fix"); |
| |
| assert_equals(fix.offsetTop, 0); |
| |
| abs.style.top = "100px"; |
| assert_equals(fix.offsetTop, 100); |
| }, "Abs-pos in rel-pos container updates fixed-pos child when moved."); |
| |
| </script> |
