scroll-marker-group-keeps-active-in-view.html (3242B)
1 <!DOCTYPE html> 2 <html class="reftest-wait"> 3 <head> 4 <title>CSS Test: scroll tracking for ::scroll-markers when scroll-marker-group is scrollable </title> 5 <link rel="help" href="https://drafts.csswg.org/css-overflow-5/#active-scroll-marker"> 6 <link rel="match" href="scroll-marker-group-keeps-active-in-view-ref.html"> 7 <script src="/css/css-transitions/support/helper.js"></script> 8 <script src="/dom/events/scrolling/scroll_support.js"></script> 9 <script src="/common/reftest-wait.js"></script> 10 </head> 11 <body> 12 <style> 13 .scroller { 14 height: 500px; 15 width: 80vw; 16 border: solid 1px; 17 overflow-x: scroll; 18 justify-self: center; 19 white-space: nowrap; 20 padding-top: 50px; 21 scroll-snap-type: x mandatory; 22 scroll-marker-group: after; 23 &::scroll-marker-group { 24 border: solid 1px black; 25 height: 40px; 26 width: 500px; 27 display: grid; 28 grid-auto-flow: column; 29 justify-self: center; 30 overflow-x: scroll; 31 white-space: nowrap; 32 scroll-behavior: smooth; 33 } 34 counter-set: markeridx -1; 35 } 36 37 .box { 38 height: 400px; 39 width: 40%; 40 border: 1px solid; 41 display: inline-block; 42 margin-left: 50px; 43 margin-right: 50px; 44 scroll-snap-align: center; 45 align-content: center; 46 text-align: center; 47 &::scroll-marker { 48 content: counter(markeridx); 49 counter-increment: markeridx; 50 width: 20px; 51 height: 20px; 52 background-color: red; 53 margin-left: 100px; 54 } 55 &::scroll-marker:target-current { 56 background-color: green; 57 } 58 } 59 60 </style> 61 <div class="scroller" id="carousel"> 62 <div class="box" id="box0"><p>0</p></div> 63 <div class="box" id="box1"><p>1</p></div> 64 <div class="box" id="box2"><p>2</p></div> 65 <div class="box" id="box3"><p>3</p></div> 66 <div class="box" id="box4"><p>4</p></div> 67 <div class="box" id="box5"><p>5</p></div> 68 <div class="box" id="box6"><p>6</p></div> 69 <div class="box" id="box7"><p>7</p></div> 70 <div class="box" id="box8"><p>8</p></div> 71 <div class="box" id="box9"><p>9</p></div> 72 <div class="box" id="box10"><p>10</p></div> 73 <div class="box" id="box11"><p>11</p></div> 74 <div class="box" id="box12"><p>12</p></div> 75 <div class="box" id="box13"><p>13</p></div> 76 <div class="box" id="box14"><p>14</p></div> 77 <div class="box" id="box15"><p>15</p></div> 78 </div> 79 <script> 80 // carousel.scrollLeft = carousel.scrollWidth; 81 async function runTest() { 82 // Wait for the (instant) scroll of the carousel itself. 83 let scrollend_promise = 84 waitForScrollEndFallbackToDelayWithoutScrollEvent(carousel); 85 // Scroll to the max horizontal offset. 86 carousel.scrollLeft = carousel.scrollWidth; 87 await scrollend_promise; 88 // Wait for the (smooth) scroll of the scroll-marker-group pseudo. 89 scrollend_promise = 90 waitForScrollEndFallbackToDelayWithoutScrollEvent(carousel); 91 await scrollend_promise; 92 takeScreenshot(); 93 } 94 waitForCompositorReady().then(runTest); 95 </script> 96 </body> 97 </html>