JSFiddle - React, Tailwind, and code Playground

HTML

<a href="interna.php#thumb1" class="thumb" >Thumb1</a>
<div id="thumb1">
    <iframe width="820" height="420" data-src="https://www.youtube.com/embed/eBordIVMoDQ" frameborder="0" allowfullscreen></iframe>
</div>

JavaScript

$('.thumb').click(function(e) {
    e.preventDefault();
    var src = this.getAttribute("href").split('#');
    var id = src.pop();
    var url = src[0];
    var iframe = document.querySelector('#' + id + ' iframe');
    iframe.src = iframe.dataset.src;
});