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Test Info: Warnings
- This test has a WPT meta file that expects 8 subtest issues.
- This WPT test may be referenced by the following Test IDs:
- /css/cssom-view/element-scroll-promise-interruption.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<title>Element scroll promises are interrupted correctly</title>
<meta name="timeout" content="long">
<meta name="viewport" content="width=device-width,initial-scale=1">
<link rel="author" title="Mustaq Ahmed" href="mailto:mustaq@chromium.org">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/dom/events/scrolling/scroll_support.js"></script>
<style>
.filler { height: 5000px }
.scroller {
overflow: scroll;
height: 100px;
}
</style>
<div id="scroller" class="scroller">
<div class="filler"></div>
<div class="filler"></div>
<div id="inner_scroller" class="scroller">
<div class="filler"></div>
<div class="filler"></div>
</div>
</div>
<div id="other_scroller" class="scroller">
<div class="filler"></div>
</div>
<script>
"use strict";
const scroller = document.getElementById("scroller");
const inner_scroller = document.getElementById("inner_scroller");
const other_scroller = document.getElementById("other_scroller");
const target_at_5000px = scroller.firstElementChild.nextElementSibling;
const innertarget_at_5000px = inner_scroller.lastElementChild;
function resetScrollPositions() {
scroller.scrollTop = 0;
inner_scroller.scrollTop = 0;
other_scroller.scrollTop = 0;
assert_true(!scroller.scrollTop && !inner_scroller.scrollTop
&& !other_scroller.scrollTop, "Sanity check initial position");
}
promise_setup(async () => {
await waitForCompositorReady();
});
for (const scroll_method of ["scrollTo", "scrollBy", "scrollIntoView"]) {
promise_test(async () => {
resetScrollPositions();
let promise1 = scroll_method != "scrollIntoView"
? scroller[scroll_method]({ top: 5000, behavior: "smooth" })
: target_at_5000px.scrollIntoView({ behavior: "smooth" });
const pos2 = 7000;
scroller.scrollTop = pos2;
assert_equals(scroller.scrollTop, pos2, "Position before promise wait");
await promise1;
assert_equals(scroller.scrollTop, pos2, "Position after promise wait");
}, `Element.${scroll_method} interrupted by a non-promise scroll`);
promise_test(async () => {
resetScrollPositions();
const pos1 = 5000;
let promise1 = scroll_method != "scrollIntoView"
? scroller[scroll_method]({ top: pos1, behavior: "smooth" })
: target_at_5000px.scrollIntoView({ behavior: "smooth" });
other_scroller.scrollTop = 100;
assert_not_equals(scroller.scrollTop, pos1,
"Position before promise wait");
await promise1;
assert_equals(scroller.scrollTop, pos1, "Position after promise wait");
}, `Element.${scroll_method} uninterrupted by an unrelated non-promise scroll`);
}
for (const interrupt_behavior of ["auto", "smooth"]) {
promise_test(async () => {
resetScrollPositions();
const pos1 = 5000;
let promise1 = scroller.scrollTo({ top: pos1, behavior: "smooth" });
const pos2 = 7000;
let promise2 =
scroller.scrollTo({ top: pos2, behavior: interrupt_behavior });
assert_not_equals(scroller.scrollTop, pos1,
"Position before first promise wait");
await promise1;
assert_not_equals(scroller.scrollTop, pos1,
"Position after first promise wait");
await promise2;
assert_equals(scroller.scrollTop, pos2,
"Position after interrupting promise wait");
}, `Element.scrollTo: interrupted by ${interrupt_behavior} scroll`);
promise_test(async () => {
resetScrollPositions();
const pos1 = 5000;
let promise1 = scroller.scrollBy({ top: pos1, behavior: "smooth" });
const pos2 = 2000;
let promise2 =
scroller.scrollBy({ top: pos2, behavior: interrupt_behavior });
assert_not_equals(scroller.scrollTop, pos1,
"Position before first promise wait");
await promise1;
assert_not_equals(scroller.scrollTop, pos1,
"Position after first promise wait");
await promise2;
assert_equals(scroller.scrollTop, pos2,
"Position after interrupting promise wait");
}, `Element.scrollBy: interrupted by ${interrupt_behavior} scroll`);
promise_test(async () => {
resetScrollPositions();
const pos1 = 5000;
let promise1 = target_at_5000px.scrollIntoView({ behavior: "smooth" });
const pos2 = 7000;
let promise2 =
scroller.scrollTo({ top: pos2, behavior: interrupt_behavior });
assert_not_equals(scroller.scrollTop, pos1,
"Position before first promise wait");
await promise1;
assert_not_equals(scroller.scrollTop, pos1,
"Position after first promise wait");
await promise2;
assert_equals(scroller.scrollTop, pos2,
"Position after interrupting promise wait");
}, `Element.scrollIntoView: interrupted by ${interrupt_behavior} scroll`);
}
// Below are scrollIntoView tests involving nested scrollers.
promise_test(async () => {
resetScrollPositions();
let promise1 = target_at_5000px.scrollIntoView({ behavior: "smooth" });
let promise2 = innertarget_at_5000px.scrollIntoView({ behavior: "smooth" });
await promise1;
assert_not_equals(scroller.scrollTop, 5000,
"Position after first promise wait");
await promise2;
assert_equals(scroller.scrollTop, 10000,
"Position after interrupting promise wait");
assert_equals(inner_scroller.scrollTop, 5000,
"Inner-position after interrupting promise wait");
}, `Element.scrollIntoView: interrupted by inner scroll`);
promise_test(async () => {
resetScrollPositions();
let promise1 = innertarget_at_5000px.scrollIntoView({ behavior: "smooth" });
let promise2 = target_at_5000px.scrollIntoView({ behavior: "smooth" });
await promise1;
assert_not_equals(scroller.scrollTop, 10000,
"Position after first promise wait");
await promise2;
assert_equals(scroller.scrollTop, 5000,
"Position after interrupting promise wait");
}, `Element.scrollIntoView: interrupted by outer scroll`);
</script>