<!DOCTYPE html>
<html>
<head>
<title>CSSOM View - Unrelated scroll gesture while scrollIntoView is ongoing</title>
<link rel="help" href="https://drafts.csswg.org/cssom-view/#dom-element-scrollintoview">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="/css/css-scroll-snap/support/common.js"></script>
<script src="/dom/events/scrolling/scroll_support.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="programmatic_scroller" class="scroller">
<div class="space"></div>
<div class="box target" id="target"></div>
</div>
<div id="gesture_scroller" class="scroller">
<div class="space"></div>
</div>
<script>
const programmatic_scroller =
document.getElementById("programmatic_scroller");
const gesture_scroller = document.getElementById("gesture_scroller");
const target = document.getElementById("target");
promise_test(async (t) => {
await waitForCompositorCommit();
const scrollend_promises = [
waitForScrollEnd(programmatic_scroller),
waitForScrollEnd(gesture_scroller)
]
// As soon as we observe a scroll event, begin a gesture scroll on the
// second scroll container.
programmatic_scroller.addEventListener("scroll", async () => {
await new test_driver.Actions().scroll(0, 0, 0, 100,
{ origin: gesture_scroller })
.send();
}, { once: true });
target.scrollIntoView({ behavior: "smooth" });
await Promise.all(scrollend_promises);
assert_equals(gesture_scroller.scrollTop, 100,
"gesture scroll completed");
assert_approx_equals(programmatic_scroller.scrollTop, target.offsetTop,
1, "scrollIntoView completed");
}, "scrollIntoView is not interrupted by unrelated gesture scroll");
</script>
</body>
</html>
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