JSFiddle - React, Tailwind, and code Playground

HTML

<div id="Panel1" style="left: 150px; top: 150px; width: 400px; height: 300px; background-color: Yellow;">
</div>
<div id="output"></div>

JavaScript

$(function() {
    ReadPosition();
});

function ReadPosition() {
    $("#output").html($("#Panel1").css("left"));
}