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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<style>
div {
background-color: lime;
height: 20px;
opacity: 1;
transition: 0.5s opacity;
}
.transition {
opacity: 0;
}
</style>
</head>
<body>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<script>
"use strict";
// This function is called from test.
// eslint-disable-next-line
async function startFastMutations() {
const targets = document.querySelectorAll("div");
for (let i = 0; i < 10; i++) {
for (const target of targets) {
target.classList.toggle("transition");
await wait(15);
}
}
}
async function wait(ms) {
return new Promise(resolve => {
setTimeout(resolve, ms);
});
}
</script>
</body>
</html>