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<!DOCTYPE html>
<title>Scroll back to initial position</title>
<meta name="timeout" content="long">
<link rel="author" title="Yupei Wang" href="mailto:perryuwang@tencent.com">
<link rel="help" href="https://drafts.csswg.org/cssom-view/#smooth-scrolling">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/scroll-behavior.js"></script>
<style>
.filler { height: 1000px }
#scrollable {
overflow: scroll;
width: 100px;
height: 100px;
}
</style>
<div id="log"></div>
<div id="testContainer">
<div id="scrollable">
<div class="filler"></div>
</div>
</div>
<script>
promise_test(() => {
resetScroll(scrollable);
assert_equals(scrollable.scrollTop, 0, "Inital value of scrollTop");
scrollNode(scrollable, "scroll", "smooth", 0, 500);
scrollNode(scrollable, "scroll", "smooth", 0, 0);
return waitForScrollEnd(scrollable).then(() => {
assert_equals(scrollable.scrollTop, 0, "Final value of scrollTop");
});
}, "Element should scroll back to initial position with smooth behavior");
promise_test(() => {
resetScroll(scrollable);
assert_equals(scrollable.scrollTop, 0, "Inital value of scrollTop");
scrollNode(scrollable, "scroll", "smooth", 0, 500);
scrollNode(scrollable, "scroll", "auto", 0, 0);
return waitForScrollEnd(scrollable).then(() => {
assert_equals(scrollable.scrollTop, 0, "Final value of scrollTop");
});
}, "Element should scroll back to initial position with auto behavior");
</script>
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