auto-scrollbars.html (1817B)
1 <!doctype html> 2 <title>CSS Container Queries Test: scrollbar stability for @container queries and overflow:auto</title> 3 <link rel="help" href="https://drafts.csswg.org/css-conditional-5/#container-queries"> 4 <link rel="help" href="https://drafts.csswg.org/css-overflow-3/#scrollbar-layout"> 5 <script src="/resources/testharness.js"></script> 6 <script src="/resources/testharnessreport.js"></script> 7 <script src="support/cq-testcommon.js"></script> 8 <style> 9 #scroller { 10 height: 100px; 11 width: 100px; 12 overflow-y: auto; 13 } 14 #container { 15 container-type: inline-size; 16 } 17 #inner { 18 height: 100px; 19 border-bottom: 1px solid red; 20 } 21 @container (max-width: 99px) { 22 #inner { 23 height: 50px; 24 } 25 } 26 </style> 27 <div id="precondition" style="width:100px;height:100px;overflow:scroll"></div> 28 <div id="scroller"> 29 <div id="container"> 30 <div id="inner"></div> 31 </div> 32 </div> 33 <script> 34 setup(() => { 35 assert_implements_size_container_queries(); 36 }); 37 38 const has_overlay_scrollbars = precondition.clientWidth === 100; 39 let initialScrollerWidth = scroller.clientWidth; 40 test(() => { 41 if (has_overlay_scrollbars) return; 42 assert_equals(getComputedStyle(inner).height, "50px", 43 "Layout with a scrollbar means the container query applies"); 44 }, "Initial layout - expecting a scrollbar without overflowing content instead of overflowing content without a scrollbar"); 45 46 test(() => { 47 if (has_overlay_scrollbars) return; 48 inner.style.borderBottomWidth = "2px"; 49 assert_equals(scroller.clientWidth, initialScrollerWidth, "Scrollbar visibility is consistent after reflow."); 50 assert_equals(getComputedStyle(inner).height, "50px", 51 "Layout with a scrollbar means the container query applies"); 52 }, "Same result after a reflow"); 53 54 </script>