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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Test: scroll tracking for ::scroll-markers when scroll containers has large padding </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="/resources/testdriver.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="support/scroll-marker-support.js"></script>
<script src="/dom/events/scrolling/scroll_support.js"></script>
</head>
<body>
<style>
.wrapper {
display: grid;
justify-content: center;
}
.carousel {
display: grid;
grid-auto-flow: column;
width: 1600px;
height: 512px;
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;
&>.item {
scroll-snap-align: center;
height: 80%;
width: 318px;
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;
}
}
&>.padding {
width: 1600px;
height: 90%;
border: solid 1px 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">
<div class="carousel" id="carousel">
<div class="padding"></div>
<div class="item" tabindex=0>1</div>
<div class="item" tabindex=0>2</div>
<div class="item" tabindex=0>3</div>
<div class="item" tabindex=0>4</div>
<div class="item" tabindex=0>5</div>
<div class="item" tabindex=0>6</div>
<div class="item" tabindex=0>7</div>
<div class="item" tabindex=0>8</div>
<div class="item" tabindex=0>9</div>
<div class="item" tabindex=0>10</div>
<div class="item" tabindex=0>11</div>
<div class="item" tabindex=0>12</div>
<div class="item" tabindex=0>13</div>
<div class="item" tabindex=0>14</div>
<div class="item" tabindex=0>15</div>
<div class="item" tabindex=0>16</div>
<div class="padding"></div>
</div>
</div>
<script>
const carousel = document.getElementById("carousel");
const items = carousel.querySelectorAll(".item");
RED = "rgb(255, 0, 0)";
GREEN = "rgb(0, 128, 0)";
let current_expected_marker_idx = null;
let current_request_id = null;
function watchFrames() {
current_request_id = requestAnimationFrame(() => {
if (current_expected_marker_idx !== null) {
verifySelectedMarker(current_expected_marker_idx, items, GREEN, RED);
}
current_request_id = requestAnimationFrame(watchFrames);
});
}
// The distribute range[1] is a portion of the scroll range in which we
// determine the active scroll-marker in a way that accounts for unreachable
// scroll targets[2].
// This tests what happens when we scroll into the distribute range in a
// layout scenario where (because of the padding) there is no scroll target
// in the distribute range.
// [1] https://drafts.csswg.org/css-overflow-5/#:~:text=distribute%20range
// [2] https://github.com/w3c/csswg-drafts/issues/11165
async function scroll_test(t, scrollAmount) {
await waitForCompositorCommit();
const initial_offset = carousel.scrollLeft;
// Watch every frame, verifying the selected marker.
watchFrames();
const scrollend_promise =
waitForScrollEndFallbackToDelayWithoutScrollEvent(carousel);
const actions_promise = new test_driver.Actions().scroll(0, 0,
scrollAmount, 0, { origin: carousel }).send();
await Promise.all([actions_promise, scrollend_promise]);
assert_equals(carousel.scrollLeft, initial_offset,
"carousel is snapped back to initial position.");
cancelAnimationFrame(current_request_id);
current_expected_marker_idx = null;
current_request_id = null;
}
promise_test(async (t) => {
await waitForCompositorCommit();
current_expected_marker_idx = 0;
// Scroll left padding into view.
const scrollAmount = -carousel.clientWidth;
await scroll_test(t, scrollAmount);
verifySelectedMarker(0, items, GREEN, RED);
}, "scroll-marker selection at left edge with padding");
promise_test(async (t) => {
await waitForCompositorCommit();
await waitForScrollReset(t, carousel, carousel.scrollWidth, 0);
current_expected_marker_idx = 15;
// Scroll right padding into view.
const scrollAmount = carousel.clientWidth;
await scroll_test(t, scrollAmount);
verifySelectedMarker(15, items, GREEN, RED);
}, "scroll-marker selection at right edge with padding");
</script>
</body>
</html>
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