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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Test: scroll tracking for ::scroll-markers whose orignatin elements cannot be scroll-aligned </title>
</head>
<body>
<style>
.wrapper {
display: grid;
justify-content: center;
}
.carousel {
width: 800px;
height: 200px;
overflow-x: scroll;
scroll-snap-type: x mandatory;
list-style-type: none;
scroll-behavior: smooth;
border: solid 2px grey;
padding-top: 10%;
text-align: center;
counter-set: markeridx -1;
columns: 2;
& > :nth-child(odd)::scroll-marker {
content: counter(markeridx);
counter-increment: markeridx;
align-content: center;
text-align: center;
width: 35px;
height: 35px;
border-radius: 50%;
margin: 3px;
background-color: red;
}
/* item 4 is child 5 */
& > :nth-child(5)::scroll-marker {
background-color: green;
}
&>.item {
scroll-snap-align: none;
height: 80%;
width: 158px;
border: 1px solid;
place-content: center;
display: inline-block;
}
/* Item 3 is child 4. Starting from scrollLeft=0, calling
box4.scrollIntoView ends up in a position that aligns box 3. */
& > :nth-child(4){
scroll-snap-align: center;
}
scroll-marker-group: after;
&::scroll-marker-group {
height: 45px;
display: flex;
align-items: center;
justify-content: center;
border: solid 1px black;
border-radius: 30px;
}
}
</style>
<div class="wrapper" id="wrapper">
<div class="carousel" id="carousel">
<div class="item item0" tabindex=0>0</div>
<div class="item item1" tabindex=0>1</div>
<div class="item item2" tabindex=0>2</div>
<div class="item item3" tabindex=0>3</div>
<div class="item item4" tabindex=0>4</div>
<div class="item item5" tabindex=0>5</div>
<div class="item item6" tabindex=0>6</div>
<div class="item item7" tabindex=0>7</div>
<div class="item item8" tabindex=0>8</div>
<div class="item item9" tabindex=0>9</div>
<div class="item item10" tabindex=0>10</div>
<div class="item item11" tabindex=0>11</div>
<div class="item item12" tabindex=0>12</div>
<div class="item item13" tabindex=0>13</div>
<div class="item item14" tabindex=0>14</div>
<div class="item item15" tabindex=0>15</div>
</div>
</div>
</body>
</html>