JSFiddle - React, Tailwind, and code Playground

HTML

<div id="constrained">Content</div>

<div id="nonconst">Other content</div>

CSS

#constrained{
    height:100px;
}

.magicHeight
{
    height: 1069px;
}

JavaScript

alert(IsHeightSet('#constrained'));
alert(IsHeightSet('#nonconst'));
    
function IsHeightSet(id)
{
    var clone = $(id).clone();
    clone.addClass('magicHeight');
    
    return (clone.height() == 1069)? false : true;
}