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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<style>
#target1 {
width: 50px;
height: 50px;
background: red;
}
#target2 {
width: 50px;
height: 50px;
background: green;
}
#target3 {
width: 50px;
height: 50px;
background: blue;
}
</style>
</head>
<body>
<div id="target1"></div>
<div id="target2"></div>
<div id="target3"></div>
<script>
/* globals KeyframeEffect, Animation */
"use strict";
let animations = [{
id: "target1",
frames: [{ opacity: 0, offset: 0 }, { opacity: 1, offset: 1 }],
timing: {
duration: 100,
iterations: 2,
iterationStart: 0.25,
fill: "both"
}
}, {
id: "target2",
frames: [{ opacity: 0, offset: 0 }, { opacity: 1, offset: 1 }],
timing: {
duration: 100,
iterations: 1,
iterationStart: 0.25,
fill: "both"
}
}, {
id: "target3",
frames: [{ opacity: 0, offset: 0 }, { opacity: 1, offset: 1 }],
timing: {
duration: 100,
iterations: 1.5,
iterationStart: 2.5,
fill: "both"
}
}];
for (let {id, frames, timing} of animations) {
let effect = new KeyframeEffect(document.getElementById(id),
frames, timing);
let animation = new Animation(effect, document.timeline);
animation.play();
}
</script>
</body>
</html>
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