JSFiddle - React, Tailwind, and code Playground

HTML

<div id="test" > test </div>

CSS

#test{
    border: 1px solid #000;
}

JavaScript

var element = document.getElementById('test');
    inOverflow = window.getComputedStyle(element).overflow,
    inHeight = element.clientHeight;

element.style.overflow = 'hidden';

var tempDiv = document.createElement('div');

tempDiv.style.height = element.clientHeight + 'px';
element.appendChild(tempDiv);

if(element.clientHeight !== inHeight){
    console.log('height is auto');
}else{
    console.log('height is ' + inHeight + 'px');
}

element.removeChild(tempDiv);
element.style.overflow = inOverflow;