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<!DOCTYPE html>
<html>
<head>
<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="/css/css-scroll-snap-2/resources/common.js"></script>
<script src="/css/css-scroll-snap-2/resources/programmatic-scroll-common.js"></script>
ß <script src="/web-animations/testcommon.js"></script>
</head>
<body>
<style>
:root {
scroll-snap-type: y mandatory;
}
.box {
position: absolute;
left: 150px;
height: 80vh;
width: 100px;
border: solid 1px white;
}
.snap {
scroll-snap-align: start;
}
.blue {
background-color: blue;
}
.green {
background-color: green;
}
.yellow {
background-color: yellow;
}
#snap_area_1 {
top: 0px;
}
#snap_area_2 {
top: calc(80vh + 2px);
}
#snap_area_3 {
top: calc(160vh + 4px);
}
.large_space {
height: 400vh;
width: 400vw;
position: absolute;
}
</style>
<div class="large_space"></div>
<div id="snap_area_1" class="blue snap box"></div>
<div id="snap_area_2" class="green snap box"></div>
<div id="snap_area_3" class="yellow snap box"></div>
<script>
const scroller = document.scrollingElement;
const snap_area_2 = document.getElementById("snap_area_2");
promise_test(async (t) => {
await waitForCompositorCommit();
const test_data = {
scroller: scroller,
scrolling_function: async () => {
scroller.scrollTo(0, snap_area_2.offsetTop);
},
expected_snap_targets: { block: snap_area_2, inline: null },
expected_scroll_offsets: {
x: 0,
y: snap_area_2.offsetTop
}
};
await test_snap_event(t, test_data, "snapchanging");
}, "snapchanging fires on programmatic scrolls that changes a scroller's" +
" snap targets.");
promise_test(async (t) => {
await test_programmatic_scroll_onsnapchanging(t, scroller, document,
snap_area_2);
}, "programmatic scroll triggers Document.snapchanging when scrolling a " +
"snap container");
promise_test(async (t) => {
checkSnapEventSupport("snapchanging");
await waitForScrollReset(t, scroller);
await waitForCompositorCommit();
let snap_event_promise = waitForSnapEvent(document, "snapchanging", false);
// The snap areas are far apart enough that 10px is not enough to trigger
// a change in snap targets.
const small_scroll_offset = 10;
scroller.scrollTo(0, small_scroll_offset);
let evt = await snap_event_promise;
assert_equals(evt, null, "no snap event since scroller is back to top");
assert_equals(scroller.scrollTop, 0, "scroller snaps back to the top");
assert_equals(scroller.scrollLeft, 0, "scroller snaps back to the left");
}, "snapchanging does not fire on programmatic scrolls that don't " +
"trigger a change in snap targets.");
</script>
</body>
</html>
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