JSFiddle - React, Tailwind, and code Playground

HTML

<div id="foo"><strong>Remember</strong> <em>me</em>.</div>

JavaScript

// Reference to our element
var foo = $("#foo");

// Store original HTML on data
foo.data( "original", foo.html() );

// Change html content
foo.html( "New Content" );

// In two seconds, restore original HTML
setTimeout(function(){
    foo.html( foo.data( "original" ) );
}, 2000);