| <!DOCTYPE html> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io"> |
| <link rel="author" title="Mozilla" href="https://mozilla.org"> |
| <link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1561450"> |
| <link rel="help" href="https://drafts.csswg.org/css-scroll-anchoring/#suppression-triggers"> |
| <style> |
| body { margin: 0 } |
| .content { |
| height: 45vh; |
| background: lightblue; |
| } |
| </style> |
| <div class="content"></div> |
| <div id="hidden" style="display: none; height: 200px"></div> |
| <div class="content"></div> |
| <div class="content"></div> |
| <div class="content"></div> |
| <script> |
| let first = true; |
| const t = async_test("Scroll adjustments don't happen if triggered from scroll event listeners"); |
| onscroll = t.step_func(function() { |
| assert_true(first, "Should only get one event"); |
| first = false; |
| hidden.style.display = "block"; |
| hidden.offsetTop; |
| hidden.style.display = "none"; |
| requestAnimationFrame(t.step_func(function() { |
| requestAnimationFrame(t.step_func(function() { |
| t.done(); |
| })); |
| })); |
| }); |
| window.onload = t.step_func(function() { |
| window.scrollTo(0, document.scrollingElement.scrollTopMax - 200); |
| }); |
| </script> |
