<i></i>
<button> Run the animation </button>
i{
position:fixed;
width:50px;
height:50px;
border-radius:50%;
background:radial-gradient(at 30% 30%,#0000,#000a) red;
left:10px;
top:200px;
}
i.start {
animation:
x 2s linear infinite alternate,
y 2s infinite cubic-bezier(0.5,700,0.5,-700) alternate;
}
@keyframes x {
to {
left:300px;
}
}
@keyframes y {
to {
top:199.5px;
}
}
/**/
d {position:fixed;height:4px;width:4px;background:#222;border-radius:50%}
button {border:none;border-radius:10px;padding:10px 20px;cursor:pointer;position:fixed;top:20px;right:20px;font-family:sans-serif;font-size:30px;background:#c82629;color:#fff;}
let elem = document.querySelector('i');
let start;
function debug(timestamp) {
if (start === undefined)
start = timestamp;
const elapsed = timestamp - start;
let rect = elem.getBoundingClientRect();
document.body.insertAdjacentHTML("beforeBegin",'<d style="top:'+(rect.y + rect.height/2)+'px;left:'+(rect.x + rect.width/2)+'px;"></d>')
if (elapsed < 4000) {
window.requestAnimationFrame(debug);
}
}
document.querySelector("button").addEventListener("click",function() {
elem.classList.add("start");
window.requestAnimationFrame(debug);
})
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