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<!DOCTYPE html>
<html class="reftest-wait">
<head>
<title>CSS Test: scroll tracking for ::scroll-markers when scroll-marker-group is scrollable </title>
<link rel="help" href="https://drafts.csswg.org/css-overflow-5/#active-scroll-marker">
<link rel="match" href="scroll-marker-group-keeps-active-in-view-ref.html">
<script src="/css/css-transitions/support/helper.js"></script>
<script src="/dom/events/scrolling/scroll_support.js"></script>
<script src="/common/reftest-wait.js"></script>
</head>
<body>
<style>
.scroller {
height: 500px;
width: 80vw;
border: solid 1px;
overflow-x: scroll;
justify-self: center;
white-space: nowrap;
padding-top: 50px;
scroll-snap-type: x mandatory;
scroll-marker-group: after;
&::scroll-marker-group {
border: solid 1px black;
height: 40px;
width: 500px;
display: grid;
grid-auto-flow: column;
justify-self: center;
overflow-x: scroll;
white-space: nowrap;
scroll-behavior: smooth;
}
counter-set: markeridx -1;
}
.box {
height: 400px;
width: 40%;
border: 1px solid;
display: inline-block;
margin-left: 50px;
margin-right: 50px;
scroll-snap-align: center;
align-content: center;
text-align: center;
&::scroll-marker {
content: counter(markeridx);
counter-increment: markeridx;
width: 20px;
height: 20px;
background-color: red;
margin-left: 100px;
}
&::scroll-marker:target-current {
background-color: green;
}
}
</style>
<div class="scroller" id="carousel">
<div class="box" id="box0"><p>0</p></div>
<div class="box" id="box1"><p>1</p></div>
<div class="box" id="box2"><p>2</p></div>
<div class="box" id="box3"><p>3</p></div>
<div class="box" id="box4"><p>4</p></div>
<div class="box" id="box5"><p>5</p></div>
<div class="box" id="box6"><p>6</p></div>
<div class="box" id="box7"><p>7</p></div>
<div class="box" id="box8"><p>8</p></div>
<div class="box" id="box9"><p>9</p></div>
<div class="box" id="box10"><p>10</p></div>
<div class="box" id="box11"><p>11</p></div>
<div class="box" id="box12"><p>12</p></div>
<div class="box" id="box13"><p>13</p></div>
<div class="box" id="box14"><p>14</p></div>
<div class="box" id="box15"><p>15</p></div>
</div>
<script>
// carousel.scrollLeft = carousel.scrollWidth;
async function runTest() {
// Wait for the (instant) scroll of the carousel itself.
let scrollend_promise =
waitForScrollEndFallbackToDelayWithoutScrollEvent(carousel);
// Scroll to the max horizontal offset.
carousel.scrollLeft = carousel.scrollWidth;
await scrollend_promise;
// Wait for the (smooth) scroll of the scroll-marker-group pseudo.
scrollend_promise =
waitForScrollEndFallbackToDelayWithoutScrollEvent(carousel);
await scrollend_promise;
takeScreenshot();
}
waitForCompositorReady().then(runTest);
</script>
</body>
</html>
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