| <!DOCTYPE html> |
| <title>@container: scroll-state(snapped) layout change</title> |
| <link rel="help" href="https://drafts.csswg.org/css-conditional-5/#snapped"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/css/css-conditional/container-queries/support/cq-testcommon.js"></script> |
| <script src="/css/css-transitions/support/helper.js"></script> |
| <style> |
| :root { |
| scroll-snap-type: block proximity; |
| } |
| body { |
| margin: 0; |
| } |
| #filler-before { |
| height: 10px; |
| } |
| #filler-after { |
| height: 10000px; |
| } |
| #snapped { |
| position: relative; |
| top: 3000px; /* Should be enough to not snap for proximity */ |
| container-type: scroll-state; |
| scroll-snap-align: start; |
| width: 100px; |
| height: 100px; |
| } |
| #target { |
| --snapped: no; |
| @container scroll-state(snapped) { |
| --snapped: yes; |
| } |
| } |
| </style> |
| <div id="filler-before"></div> |
| <div id="snapped" class="snapped"> |
| <span id="target">#target</span> |
| </div> |
| <div id="filler-after"></div> |
| <script> |
| setup(() => assert_implements_scroll_state_container_queries()); |
| |
| promise_test(async t => { |
| await waitForAnimationFrames(2); |
| assert_equals(getComputedStyle(target).getPropertyValue("--snapped"), "no"); |
| }, "Check scroll-state(snapped) initially not matching"); |
| |
| promise_test(async t => { |
| snapped.style.top = "auto"; |
| await waitForAnimationFrames(2); |
| assert_equals(getComputedStyle(target).getPropertyValue("--snapped"), "yes"); |
| }, "scroll-state(snapped) matching after relative position changed"); |
| |
| </script> |
