fps counter

!function() {
    var times = [];
    var fps;
    var fpselm = document.createElement('p');
    fpselm.setAttribute('style', 'all: initial; position: fixed; top: 0px; right: 0px; font-family: Arial; font-size: 20px; z-index: 2000000000; background: #ffffff80; color: black; margin: 0px; pointer-events: none');
    document.body.append(fpselm);

    function loop() {
        window.requestAnimationFrame(function() {
            const now = performance.now();
            while (times.length > 0 && times[0] <= now - 1000) {
                times.shift();
            }
            times.push(now);
            fps = times.length;
            loop();
        });
    };
    setInterval(function() {
        fpselm.innerText = `${fps} FPS`
    }, 1000);

    loop();
}();