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<!doctype html>
<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
<style>
.ref { width: 14em; height: 1em; margin-top: 0; margin-bottom: 0;}
</style>
<body>
<div id="ref"></div>
<script>
const TEST_CASES = [
["blue", "red"],
["blue", "green"],
["rgb(255, 0, 0, .2)", "red"],
["blue", "red", 0.9],
["blue", "red", 0],
["currentColor", "white"],
["currentColor", "rgba(0, 0, 0, .5)"],
];
const refElement = document.getElementById("ref");
const refStyle = getComputedStyle(refElement);
let animation = null;
for (let [from, to, animationProgress] of TEST_CASES) {
const animationProgressExplicit = animationProgress !== undefined;
animationProgress = animationProgressExplicit ? animationProgress : 0.5;
// Set up the ref.
if (animation) {
animation.cancel();
}
animation = refElement.animate({
backgroundColor: [from, to],
}, { duration: 1000 });
animation.pause();
animation.currentTime = 1000 * animationProgress;
let results = animationProgress == 0.5 ? 4 : 3;
for (let i = 0; i < results; ++i) {
let element = document.createElement("div")
element.classList.add('ref')
element.style.backgroundColor = refStyle.backgroundColor;
document.body.appendChild(element)
}
}
refElement.remove()
</script>
</body>