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<!DOCTYPE HTML>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<title>Check End Position of smooth scrollIntoView</title>
<div id="container" style="height: 2500px; width: 2500px;">
<div id="content" style="height: 500px; width: 500px;margin-left: 1000px; margin-right: 1000px; margin-top: 1000px;margin-bottom: 1000px;background-color: red">
</div>
<div id="shadow"></div>
</div>
<script>
var content_height = 500;
var content_width = 500;
var window_height = document.documentElement.clientHeight;
var window_width = document.documentElement.clientWidth;
var content = document.getElementById("content");
add_completion_callback(() => document.getElementById("container").remove());
function waitForScrollEnd() {
var wait_for_scroll_start = performance.now();
var last_changed_timestamp = wait_for_scroll_start;
var last_changed_frame = 0;
var last_x = window.scrollX;
var last_y = window.scrollY;
return new Promise((resolve, reject) => {
function tick(frames, timestamp) {
// We requestAnimationFrame until at least 200ms have elapsed and at least
// 5 animation frames have run since the last change to the scroll
// offset, timing out after 8 seconds.
if (window.scrollX != last_x || window.scrollY != last_y) {
last_changed_timestamp = timestamp;
last_changed_frame = frames;
last_x = window.scrollX;
last_y = window.scrollY;
}
if (timestamp - last_changed_timestamp > 200 &&
frames - last_changed_frame > 4) {
resolve();
} else if (timestamp - wait_for_scroll_start > 8000) {
reject();
} else {
requestAnimationFrame(tick.bind(null, frames + 1));
}
}
tick(last_changed_frame, wait_for_scroll_start);
});
}
// When testing manually, we need an additional frame at beginning
// to trigger the effect.
requestAnimationFrame(() => {
promise_test(t => {
window.scrollTo(0, 0);
var expected_x = content.offsetLeft + content_width - window_width;
var expected_y = content.offsetTop + content_height - window_height;
assert_not_equals(window.scrollX, expected_x, "scrollX");
assert_not_equals(window.scrollY, expected_y, "scrollY");
content.scrollIntoView({behavior: "smooth", block: "nearest", inline:
"nearest"});
return waitForScrollEnd().then(() => {
assert_approx_equals(window.scrollX, expected_x, 1, "scrollX");
assert_approx_equals(window.scrollY, expected_y, 1, "scrollY");
});
}, "Smooth scrollIntoView should scroll the element to the 'nearest' position");
promise_test(t => {
window.scrollTo(0, 0);
var expected_x = content.offsetLeft;
var expected_y = content.offsetTop;
assert_not_equals(window.scrollX, expected_x, "scrollX");
assert_not_equals(window.scrollY, expected_y, "scrollY");
content.scrollIntoView({behavior: "smooth", block: "start", inline:
"start"});
return waitForScrollEnd().then(() => {
assert_approx_equals(window.scrollX, expected_x, 1, "scrollX");
assert_approx_equals(window.scrollY, expected_y, 1, "scrollY");
});
}, "Smooth scrollIntoView should scroll the element to the 'start' position");
promise_test(t => {
window.scrollTo(0, 0);
var expected_x = content.offsetLeft + (content_width - window_width) / 2;
var expected_y = content.offsetTop + (content_height - window_height) / 2;
assert_not_equals(window.scrollX, expected_x, "scrollX");
assert_not_equals(window.scrollY, expected_y, "scrollY");
content.scrollIntoView({behavior: "smooth", block: "center", inline:
"center"});
return waitForScrollEnd().then(() => {
assert_approx_equals(window.scrollX, expected_x, 1, "scrollX");
assert_approx_equals(window.scrollY, expected_y, 1, "scrollY");
});
}, "Smooth scrollIntoView should scroll the element to the 'center' position");
promise_test(t => {
window.scrollTo(0, 0);
var expected_x = content.offsetLeft + content_width - window_width;
var expected_y = content.offsetTop + content_height - window_height;
assert_not_equals(window.scrollX, expected_x, "scrollX");
assert_not_equals(window.scrollY, expected_y, "scrollY");
content.scrollIntoView({behavior: "smooth", block: "end", inline:
"end"});
return waitForScrollEnd().then(() => {
assert_approx_equals(window.scrollX, expected_x, 1, "scrollX");
assert_approx_equals(window.scrollY, expected_y, 1, "scrollY");
});
}, "Smooth scrollIntoView should scroll the element to the 'end' position");
});
</script>
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