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Test Info:

<!DOCTYPE html>
<html>
<head>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<style>
#inputscroller {
width: 100px;
height: 50px;
}
</style>
<input type="text" id="inputscroller"
value="qwertyuiopasddfghjklzxcvbnmqwertyuiopasddfghjklzxcvbnmqwer">
<script>
promise_test(async() => {
const inputscroller = document.getElementById("inputscroller");
assert_equals(inputscroller.scrollLeft, 0,
"text input field is not initially scrolled.");
const scrollend_promise = new Promise((resolve) => {
inputscroller.addEventListener("scrollend", resolve);
});
inputscroller.scrollLeft = 10;
await scrollend_promise;
assert_equals(inputscroller.scrollLeft, 10,
"text input field is scrolled by the correct amount");
}, "scrolled input field should receive scrollend.");
</script>
</body>
</html>