JSFiddle - React, Tailwind, and code Playground

HTML

<p id="jsHeapSizeLimit">jsHeapSizeLimit </p> 
<p id="totalJSHeapSize">totalJSHeapSize </p> 
<p id="usedJSHeapSize">usedJSHeapSize </p>

JavaScript

memoryInfo = performance.memory
var jsHeapSizeLimitOut = document.getElementById('jsHeapSizeLimit');
var totalJSHeapSizeOut = document.getElementById('totalJSHeapSize');
var usedJSHeapSizeOut = document.getElementById('usedJSHeapSize');

jsHeapSizeLimitOut.innerHTML  = "jsHeapSizeLimit: " + memoryInfo.jsHeapSizeLimit/(1024*1024) + " MB";
totalJSHeapSizeOut.innerHTML  = "totalJSHeapSize: " + memoryInfo.totalJSHeapSize/(1024*1024) + " MB";
usedJSHeapSizeOut.innerHTML  = "usedJSHeapSize: " + memoryInfo.usedJSHeapSize/(1024*1024) +" MB";