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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Test: selection of scroll-markers picks closest</title>
<link rel="help" href="https://drafts.csswg.org/css-overflow-5/#scroll-marker-pseudo">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/dom/events/scrolling/scroll_support.js"></script>
<script src="/css/css-overflow/support/scroll-marker-support.js"></script>
</head>
<body>
<style>
.wrapper {
display: grid;
justify-content: center;
}
.carousel {
display: grid;
grid-auto-flow: column;
width: 512px;
height: 512px;
overflow-x: scroll;
list-style-type: none;
border: solid 2px grey;
padding-top: 10%;
text-align: center;
counter-set: markeridx -1;
&>.item {
height: 80%;
width: 510px;
border: 1px solid;
place-content: center;
&::scroll-marker {
content: counter(markeridx);
counter-increment: markeridx;
align-content: center;
text-align: center;
width: 35px;
height: 35px;
border: 3px solid gray;
border-radius: 50%;
margin: 3px;
background-color: red;
}
&::scroll-marker:target-current {
background-color: green;
}
}
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" id="item0" tabindex=0><p>0</p></div>
<div class="item" id="item1" tabindex=0><p>1</p></div>
<div class="item" id="item2" tabindex=0><p>2</p></div>
<div class="item" id="item3" tabindex=0><p>3</p></div>
</div>
</div>
<script>
const carousel = document.getElementById("carousel");
const items = document.querySelectorAll(".item");
const wrapper = document.getElementById("wrapper");
RED = "rgb(255, 0, 0)";
GREEN = "rgb(0, 128, 0)";
const max_scroll_offset = carousel.scrollWidth - carousel.clientWidth;
async function testActiveMarker(test, scroll_position, expected_idx) {
await waitForCompositorCommit();
if (carousel.scrollLeft !== scroll_position) {
await waitForScrollReset(test, carousel, scroll_position);
}
verifySelectedMarker(expected_idx, items, GREEN, RED);
}
const SCROLL_OFFSET_EPSILON = 5;
promise_test(async(t) => {
await testActiveMarker(t, 0, 0);
}, "scroll-marker 0 selected at scrollLeft = 0");
promise_test(async(t) => {
// Scrolling to just before halfway into item0, scroll-marker 0 should
// be selected.
const scroll_position = item0.offsetWidth / 2 - SCROLL_OFFSET_EPSILON;
await testActiveMarker(t, scroll_position, 0);
}, "scroll-marker 0 selected just before mid point of item0");
promise_test(async(t) => {
// Scrolling to just after halfway into item0, scroll-marker 1 should
// be selected.
const scroll_position = item0.offsetWidth / 2 + SCROLL_OFFSET_EPSILON;
await testActiveMarker(t, scroll_position, 1);
}, "scroll-marker 1 selected just after mid point of item0");
promise_test(async(t) => {
// Scrolling to left edge of item1, scroll-marker 1 should
// be selected.
const scroll_position = item0.offsetWidth;
await testActiveMarker(t, scroll_position, 1);
}, "scroll-marker 1 selected at left edge of item1");
promise_test(async (t) => {
// Scrolling to just before halfway into item1, scroll-marker 1 should
// be selected.
const scroll_position = item0.offsetWidth + item1.offsetWidth / 2
- SCROLL_OFFSET_EPSILON;
await testActiveMarker(t, scroll_position, 1);
}, "scroll-marker 1 selected just before mid point of item1");
promise_test(async(t) => {
// Scrolling to just after halfway into item1, scroll-marker 2 should
// be selected.
const scroll_position = item0.offsetWidth + item1.offsetWidth / 2
+ SCROLL_OFFSET_EPSILON;
await testActiveMarker(t, scroll_position, 2);
}, "scroll-marker 2 selected just after mid point of item1");
promise_test(async(t) => {
// Scrolling to left edge of item2, scroll-marker 2 should
// be selected.
const scroll_position = item0.offsetWidth + item1.offsetWidth;
await testActiveMarker(t, scroll_position, 2);
}, "scroll-marker 2 selected just at left edge of item2");
</script>
</body>
</html>
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