JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://rawgit.com/web-animations/web-animations-js/master/web-animations.js"http://jsfiddle.net/kitsunde/CqnpW/1/#run></script>

<div id="fps"></div>

JavaScript

var animation = new Animation(
    document.querySelector(".canvas #red"), 
    function(){
        var lastTime = null;
        function(currentTime, timelineTime){
            if(!lastTime){
              lastTime = timelineTime;
              return;
            }
            $("#fps").text(
                1 / parseInt(timelineTime - lastTime, 10)
            );
        }
    },
    {duration: 2000}
);
document.timeline.play(animation);