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<!DOCTYPE html>
<html style="reftest-wait">
<head>
<style>
#target {
width: 100px;
height: 100px;
background: green;
margin: 300px;
}
</style>
</head>
<body>
<div id="target"></div>
<div style="height: 1000px"></div>
<script>
function scrollBy(y) {
return new Promise(resolve => {
addEventListener("scroll", () => {
requestAnimationFrame(() => {
requestAnimationFrame(resolve);
});
}, { once: true, capture: true });
document.documentElement.scrollBy({
top: y,
behavior: "instant"
});
});
}
addEventListener("load", async () => {
await scrollBy(200);
document.documentElement.classList.remove("reftest-wait");
});
</script>
</body>
</html>