Edit fiddle - JSFiddle - React, Tailwind, and code Playground

JSFiddle - React, Tailwind, and code Playground

HTML

<p id="output"></p>
<div id="load-iframe"><p>Loading iframe ...</p></div>
<iframe id="iframe_id" src="https://koop.energie.check24.de/184979/stromsuchen/strom/el/?zipcode=10115&totalconsumption=2000" width="100%" height="400" onload="document.getElementById('load-iframe').style.display='none';"></iframe>

JavaScript

var iframeReference = document.getElementById("iframe_id");
var url = iframeReference ? new URL(iframeReference.src) : undefined;
document.getElementById("output").innerHTML = url;

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JSFiddle - React, Tailwind, and code Playground

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