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<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1/#scroll-snap-type" />
<title>Arrow key scroll snapping</title>
<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
<meta name="flags" content="should">
<meta name="assert"
content="Test passes if keyboard scrolling correctly snaps on a snap
container">
<link rel="stylesheet" href="../support/common.css">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/dom/events/scrolling/scroll_support.js"></script>
<script src="../support/common.js"></script>
<div id="scroller" tabindex="0">
<div id="space"></div>
<div class="snap left top" id="top-left"></div>
<div class="snap right top" id="top-right"></div>
<div class="snap left bottom" id="bottom-left"></div>
</div>
<script>
const scroller = document.getElementById("scroller");
const topLeft = document.getElementById("top-left");
const topRight = document.getElementById("top-right");
scrollLeft = () => scroller.scrollLeft;
scrollTop = () => scroller.scrollTop;
function ScrollCounter(test, eventTarget) {
this.count = 0;
const scrollListener = () => {
this.count++;
}
eventTarget.addEventListener('scroll', scrollListener);
test.add_cleanup(() => {
eventTarget.removeEventListener('scroll', scrollListener);
});
}
async function initializeScrollPosition(scroller, x, y) {
return new Promise(async (resolve) => {
if (scroller.scrollLeft != x || scroller.scrollTop != y) {
const scrollEndPromise = waitForScrollEndFallbackToDelayWithoutScrollEvent(scroller);
scroller.scrollTo(x, y);
await scrollEndPromise;
}
resolve();
});
}
promise_test(async t => {
await initializeScrollPosition(scroller, 0, 0);
assert_equals(scroller.scrollTop, 0, "verify test pre-condition");
const scrollCounter = new ScrollCounter(t, scroller);
const scrollEndPromise = waitForScrollEndFallbackToDelayWithoutScrollEvent(scroller);
await keyPress(scroller, "ArrowDown");
await scrollEndPromise;
assert_equals(scroller.scrollTop, 400);
// Make sure we don't jump directly to the new snap position.
assert_greater_than(scrollCounter.count, 1);
}, "Snaps to bottom-left after pressing ArrowDown");
promise_test(async t => {
await initializeScrollPosition(scroller, 0, 400);
assert_equals(scroller.scrollTop, 400, "verify test pre-condition");
const scrollCounter = new ScrollCounter(t, scroller);
const scrollEndPromise = waitForScrollEndFallbackToDelayWithoutScrollEvent(scroller);
await keyPress(scroller, "ArrowUp");
await scrollEndPromise;
assert_equals(scroller.scrollTop, 0);
// Make sure we don't jump directly to the new snap position.
assert_greater_than(scrollCounter.count, 1);
}, "Snaps to top-left after pressing ArrowUp");
promise_test(async t => {
await initializeScrollPosition(scroller, 0, 0);
assert_equals(scroller.scrollTop, 0, "verify test pre-condition");
const scrollCounter = new ScrollCounter(t, scroller);
const scrollEndPromise = waitForScrollEndFallbackToDelayWithoutScrollEvent(scroller);
await keyPress(scroller, "ArrowRight");
await scrollEndPromise;
assert_equals(scroller.scrollLeft, 400);
// Make sure we don't jump directly to the new snap position.
assert_greater_than(scrollCounter.count, 1);
}, "Snaps to top-right after pressing ArrowRight");
promise_test(async t => {
await initializeScrollPosition(scroller, 400, 0);
assert_equals(scroller.scrollLeft, 400, "verify test pre-condition");
const scrollCounter = new ScrollCounter(t, scroller);
const scrollEndPromise = waitForScrollEndFallbackToDelayWithoutScrollEvent(scroller);
await keyPress(scroller, "ArrowLeft");
await scrollEndPromise;
assert_equals(scroller.scrollLeft, 0);
// Make sure we don't jump directly to the new snap position.
assert_greater_than(scrollCounter.count, 1);
}, "Snaps to top-left after pressing ArrowLeft");
promise_test(async t => {
t.add_cleanup(function() {
topLeft.style.width = "";
topRight.style.left = "400px";
});
// Make the snap area cover the snapport.
topLeft.style.width = "800px";
// Make the distance between the previous and the next snap position larger
// than snapport.
topRight.style.left = "500px";
await initializeScrollPosition(scroller, 0, 0);
assert_equals(scroller.scrollLeft, 0, "verify test pre-condition");
const scrollEndPromise = waitForScrollEndFallbackToDelayWithoutScrollEvent(scroller);
await keyPress(scroller, "ArrowRight");
await scrollEndPromise;
assert_between_exclusive(scroller.scrollLeft, 0, 500);
}, "If the original intended offset is valid as making a snap area cover the"
+ "snapport, and there's no other snap offset in between, use the original"
+ "intended offset");
promise_test(async t => {
t.add_cleanup(function() {
topLeft.style.width = "";
topRight.style.left = "400px";
topRight.style.scrollSnapStop = "";
});
// Make the snap area cover the snapport.
topLeft.style.width = "800px";
// Make the next snap offset closer than the original intended offset.
topRight.style.left = "20px";
topRight.style.scrollSnapStop = "always";
await initializeScrollPosition(scroller, 0, 0);
assert_equals(scroller.scrollLeft, 0, "verify test pre-condition");
const scrollEndPromise = waitForScrollEndFallbackToDelayWithoutScrollEvent(scroller);
await keyPress(scroller, "ArrowRight");
await scrollEndPromise;
assert_equals(scroller.scrollLeft, 20);
}, "If the original intended offset is valid as making a snap area cover the "
+ "snapport, but there's a defined snap offset in between, use the defined snap"
+ " offset.");
promise_test(async t => {
await initializeScrollPosition(scroller, 400, 0);
await keyPress(scroller, "ArrowRight");
await waitForDelayWithoutScrollEvent(scroller);
assert_equals(scroller.scrollLeft, 400);
}, "If there is no valid snap offset on the arrow key's direction other than "
+ "the current offset, and the scroll-snap-type is mandatory, stay at the "
+ "current offset.");
promise_test(async t => {
t.add_cleanup(function() {
scroller.style.scrollSnapType = "both mandatory";
scroller.style.width = "";
topLeft.style.width = "";
});
scroller.style.scrollSnapType = "both proximity";
// This test case works only if the scroll amount of pressing "ArrowRight" is
// greater than the scroll snap proximity value of the scroll container.
// "100px" width of the scroll container works on major browsers.
scroller.style.width = "100px";
topLeft.style.width = "80px";
await initializeScrollPosition(scroller, 400, 0);
assert_equals(scroller.scrollLeft, 400, "verify test pre-condition");
const scrollEndPromise = waitForScrollEndFallbackToDelayWithoutScrollEvent(scroller);
await keyPress(scroller, "ArrowRight");
await scrollEndPromise;
assert_greater_than(scroller.scrollLeft, 400);
}, "If there is no valid snap offset on the arrow key's direction other than "
+ "the current offset, and the scroll-snap-type is proximity, go to the "
+ "original intended offset");
</script>
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