scroll-state-snapped-layout-change.html (1589B)
1 <!DOCTYPE html> 2 <title>@container: scroll-state(snapped) layout change</title> 3 <link rel="help" href="https://drafts.csswg.org/css-conditional-5/#snapped"> 4 <script src="/resources/testharness.js"></script> 5 <script src="/resources/testharnessreport.js"></script> 6 <script src="/css/css-conditional/container-queries/support/cq-testcommon.js"></script> 7 <script src="/css/css-transitions/support/helper.js"></script> 8 <style> 9 :root { 10 scroll-snap-type: block proximity; 11 } 12 body { 13 margin: 0; 14 } 15 #filler-before { 16 height: 10px; 17 } 18 #filler-after { 19 height: 10000px; 20 } 21 #snapped { 22 position: relative; 23 top: 3000px; /* Should be enough to not snap for proximity */ 24 container-type: scroll-state; 25 scroll-snap-align: start; 26 width: 100px; 27 height: 100px; 28 } 29 #target { 30 --snapped: no; 31 @container scroll-state(snapped) { 32 --snapped: yes; 33 } 34 } 35 </style> 36 <div id="filler-before"></div> 37 <div id="snapped" class="snapped"> 38 <span id="target">#target</span> 39 </div> 40 <div id="filler-after"></div> 41 <script> 42 setup(() => assert_implements_scroll_state_container_queries()); 43 44 promise_test(async t => { 45 await waitForAnimationFrames(2); 46 assert_equals(getComputedStyle(target).getPropertyValue("--snapped"), "no"); 47 }, "Check scroll-state(snapped) initially not matching"); 48 49 promise_test(async t => { 50 snapped.style.top = "auto"; 51 await waitForAnimationFrames(2); 52 assert_equals(getComputedStyle(target).getPropertyValue("--snapped"), "yes"); 53 }, "scroll-state(snapped) matching after relative position changed"); 54 55 </script>