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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<style>
.ball {
width: 80px;
height: 80px;
border-radius: 50%;
}
.script-animation {
background: #f06;
}
.css-transition {
background: #006;
transition: background-color 20s;
}
.css-animation {
background: #a06;
animation: flash 10s forwards;
}
@keyframes flash {
0% {
opacity: 1;
}
50% {
opacity: 0;
}
100% {
opacity: 1;
}
}
</style>
</head>
<body>
<div class="ball script-animation"></div>
<div class="ball css-animation"></div>
<div class="ball css-transition"></div>
<script>
/* globals KeyframeEffect, Animation */
"use strict";
setTimeout(function () {
document.querySelector(".css-transition").style.backgroundColor = "yellow";
}, 0);
let effect = new KeyframeEffect(
document.querySelector(".script-animation"), [
{opacity: 1, offset: 0},
{opacity: .1, offset: 1}
], { duration: 10000, fill: "forwards" });
let animation = new Animation(effect, document.timeline);
animation.play();
</script>
</body>
</html>
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