| <!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 inline-size; |
| scroll-snap-align: start; |
| --before: no; |
| --after: no; |
| @container scroll-state(snapped) { |
| &::before { |
| --before: yes; |
| content: " "; |
| } |
| &::after { |
| --after: yes; |
| } |
| } |
| } |
| </style> |
| <div id="filler-before"></div> |
| <div id="snapped"></div> |
| <div id="filler-after"></div> |
| <script> |
| setup(() => { |
| assert_implements_scroll_state_container_queries(); |
| assert_implements_size_container_queries(); |
| }); |
| |
| promise_test(async t => { |
| await waitForAnimationFrames(2); |
| assert_equals(getComputedStyle(snapped, "::before").getPropertyValue("--before"), "no"); |
| assert_equals(getComputedStyle(snapped, "::after").getPropertyValue("--after"), "no"); |
| }, "Initially, snapped query does not match and ::before/::after do not apply"); |
| |
| promise_test(async t => { |
| snapped.style.top = "auto"; |
| await waitForAnimationFrames(2); |
| assert_equals(getComputedStyle(snapped, "::before").getPropertyValue("--before"), "yes"); |
| assert_equals(getComputedStyle(snapped, "::after").getPropertyValue("--after"), "yes"); |
| }, "::before/::after depending on snapped query"); |
| |
| </script> |
