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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<style>
div {
background-color: lime;
height: 100px;
}
</style>
</head>
<body>
<script>
"use strict";
const duration = 100000;
function createAnimation(cls) {
const div = document.createElement("div");
div.classList.add(cls);
document.body.appendChild(div);
const animation = div.animate([{ opacity: 0 }], duration);
animation.playbackRate = 1.5;
}
createAnimation("div1");
createAnimation("div2");
</script>
</body>
</html>