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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>
<link rel="help" href="https://drafts.csswg.org/css-overflow-5/#scroll-container-scroll">
</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;
/* All odd-numbered children generate scroll-markers. For the test, we
need 2 more cxhildren to generate scroll-markers. This uses children 2
and 4.*/
& > :nth-child(odd)::scroll-marker,
& > :nth-child(2)::scroll-marker,
& > :nth-child(4)::scroll-marker {
counter-increment: markeridx;
align-content: center;
text-align: center;
width: 35px;
height: 35px;
border-radius: 50%;
margin: 3px;
background-color: red;
}
/* This lines up the scroll-markers' numbers to match the way Chromium
lays out the scroll-markers which seems to be all
element::scroll-markers first/leftmost and then,
::column-scroll-markers, despite the ::column::scroll-markers being
numbered first. The numbers are not important for the test's
functionality. They only help investigating the browser's behavior.*/
& > :nth-child(1)::scroll-marker { content: "8"; }
& > :nth-child(3)::scroll-marker { content: "0"; }
& > :nth-child(2)::scroll-marker { content: "9"; }
& > :nth-child(4)::scroll-marker { content: "1"; }
& > :nth-child(5)::scroll-marker { content: "2"; }
& > :nth-child(7)::scroll-marker { content: "3"; }
& > :nth-child(9)::scroll-marker { content: "4"; }
& > :nth-child(11)::scroll-marker { content: "5"; }
& > :nth-child(13)::scroll-marker { content: "6"; }
/* In the test, item 14 (child 15) is the scrollIntoView target.
Its column (the right-most column) should be selected and corresponds to
the column. */
& > :nth-child(15)::scroll-marker {
content: "7";
background-color: green;
}
&>.item {
scroll-snap-align: none;
height: 80%;
width: 158px;
border: 1px solid;
place-content: center;
display: inline-block;
}
/* Make only item 16 (index 15) a snap target so we are scrolled all the
way to the right edge */
& > :nth-child(14){
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 id="buttons" style></div>
</div>
</body>
</html>
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