JSFiddle - React, Tailwind, and code Playground

HTML

<iframe id="iframe1" src=""></iframe>

JavaScript

function changeIframe(newSrc){
    $("#iframe1").fadeOut('fast',function(){
        $(this).attr("src",newSrc);
            $(this).load(function(){
                $(this).fadeIn("fast"); 
            });
    });
}

changeIframe("http://www.jsfiddle.net");