JSFiddle - React, Tailwind, and code Playground

HTML

<p>We're going to test numbers from the high resolution timer and see how many of them are equivalent to their integer representation.


    
<textarea id=output></textarea>

CSS

textarea { height: 300px; width: 500px; }

JavaScript

if (!(window.performance && performance.webkitNow)) alert('chrome canary required');

var start           = performance.webkitNow();
var integers        = [];
var floatingPoints  = [];
var now;

// run (hang your browser) for 5 seconds
while (( now = performance.webkitNow()) < (start + 5 * 1000)){

    // if any are equivalent to their integer form
    if (now.toString().indexOf('.') > -1) floatingPoints.push(now);
    else                                  integers.push(now);
}

document.querySelector('#output').innerText = '' +
    ['Numbers tested: ' + (integers.length + floatingPoints.length),
     'Numbers with decimal values: ' + floatingPoints.length,
     'Numbers with integer values: ' + integers.length]
        .join('\n');

console.log('integers', integers);