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Test Info:

<!DOCTYPE html>
<html>
<head>
<title>CSSOM View - Simultaneous scrollIntoViews</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/dom/events/scrolling/scroll_support.js"></script>
<script src="/css/css-scroll-snap/support/common.js"></script>
<script src="resources/simultaneousScrollIntoViews.js"></script>
</head>
<body>
<style>
.scroller {
overflow-y: scroll;
height: 200px;
width: 200px;
background-color: teal;
border: solid 1px black;
position: relative;
display: inline-block;
}
.space {
height: 200vh;
width: 200vw;
}
.box {
height: 50px;
width: 50px;
background-color: purple;
}
.target {
position: absolute;
top: 150%;
}
</style>
<div id="scroller1" class="scroller">
<div class="space"></div>
<div class="box target" id="target1"></div>
</div>
<div id="scroller2" class="scroller">
<div class="space"></div>
<div class="box target" id="target2"></div>
</div>
<script>
const scroller1 = document.getElementById("scroller1");
const scroller2 = document.getElementById("scroller2");
const target1 = document.getElementById("target1");
const target2 = document.getElementById("target2");
const targets = [target1, target2];
const scrollers = [scroller1, scroller2];
const target_offsets = [target1.offsetTop, target2.offsetTop];
promise_test(async (t) => {
await simultaneousScrollIntoViewsTest(t,
["smooth", "smooth"],
targets,
scrollers,
target_offsets);
}, "Simultaneous smooth scrollIntoViews run to completion");
promise_test(async (t) => {
await simultaneousScrollIntoViewsTest(t,
["smooth", "instant"],
targets,
scrollers,
target_offsets);
}, "Simultaneous smooth,instant scrollIntoViews run to completion");
promise_test(async (t) => {
await simultaneousScrollIntoViewsTest(t,
["instant", "smooth"],
targets,
scrollers,
target_offsets);
}, "Simultaneous instant,smooth scrollIntoViews run to completion");
promise_test(async (t) => {
await simultaneousScrollIntoViewsTest(t,
["instant", "instant"],
targets,
scrollers,
target_offsets);
}, "Simultaneous instant scrollIntoViews run to completion");
</script>
</body>
</html>