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<!DOCTYPE html>
<title>Element.scroll* methods returning promises</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">
<link rel="help" href="https://drafts.csswg.org/cssom-view/#extension-to-the-element-interface">
<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;
width: 100px;
height: 100px;
}
</style>
<div id="scroller">
<div class="filler"></div>
<div class="filler"></div>
</div>
<script>
"use strict";
const scroller = document.getElementById("scroller");
const scroll_methods = ["scroll", "scrollTo", "scrollBy", "scrollIntoView"];
function reset() {
scroller.scrollTo({ top: 0 });
assert_equals(scroller.scrollTop, 0, "Sanity check starting position");
}
promise_setup(async () => {
await waitForCompositorReady();
});
for (const scroll_method of scroll_methods) {
for (const behavior of ["auto", "instant", "smooth"]) {
const test_label = `Element.${scroll_method}(${behavior})`;
promise_test(async () => {
let result = scroller[scroll_method]({ behavior: behavior });
assert_true(result instanceof Promise);
}, `${test_label}: return type`);
promise_test(async () => {
reset();
const offset = 5000;
let promise = (scroll_method != "scrollIntoView") ?
scroller[scroll_method]({ top: offset, behavior: behavior }) :
scroller.lastElementChild.scrollIntoView({ behavior: behavior });
if (behavior != "smooth") {
assert_equals(scroller.scrollTop, offset, "Position before await");
} else {
assert_true(0 <= scroller.scrollTop && scroller.scrollTop < offset,
"Position before await");
}
await promise;
assert_equals(scroller.scrollTop, offset, "Position after await");
}, `${test_label}: promise behavior`);
}
}
</script>
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