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<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1/#scroll-snap-type" />
<title>Tests that window should snap at user scroll end.</title>
<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="/dom/events/scrolling/scroll_support.js"></script>
<script src="support/common.js"></script>
<style>
html {
margin: 0px;
scroll-snap-type: both mandatory;
}
#content {
width: 2000px;
height: 2000px;
padding: 0px;
margin: 0px;
}
#target {
position: relative;
left: 400px;
top: 400px;
width: 400px;
height: 400px;
background-color: lightblue;
overflow: hidden;
scroll-snap-align: start;
}
</style>
<div id="content">
<div id="target">
<!-- CSSScrollSnap
Tests that the window snaps at user scroll end.
Manual steps:
1. Scroll the page once vertically and once horizontally.
2. Verify in console (or otherwise) window scroll position is same as
target's offset position -->
</div>
</div>
<script>
promise_test(async t => {
await waitForCompositorReady();
const target = document.getElementById("target");
// Inject scroll actions.
const pos_x = 20;
const pos_y = 20;
const scroll_delta_x = 100;
const scroll_delta_y = 100;
const wheelPromise = waitForWheelEvent(window);
await new test_driver.Actions()
.scroll(pos_x, pos_y, scroll_delta_x, scroll_delta_y)
.send()
await wheelPromise;
await waitForAnimationEnd(() => window.scrollY);
assert_approx_equals(window.scrollX, target.offsetLeft, 0.5,
"window.scrollX should be at snapped position.");
assert_approx_equals(window.scrollY, target.offsetTop, 0.5,
"window.scrollY should be at snapped position.");
}, "Tests that window should snap at user scroll end.");
</script>
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