JSFiddle - React, Tailwind, and code Playground

HTML

<div id="plan">
<svg xmlns="http://www.w3.org/2000/svg" version="1.1">
<g id="layer3">
   <rect width="105.71429" height="80" x="351.42856" y="152.36218" id="rect1" style="fill:#008000"></rect>
   <rect width="120" height="85.714287" x="500" y="389.50504" id="rect2" style="fill:#008000"></rect>
</g>
</svg>
</div>

JavaScript

$(document).ready(function() {
    var str = $("#plan #rect1")[0];
    alert(str);
})