JSFiddle - React, Tailwind, and code Playground

HTML

<div class="contents">
CONTENT CCC<br>
CONTENT CCC<br>
CONTENT CCC<br>
CONTENT CCC<br>
CONTENT CCC<br>
CONTENT CCC<br>

<div>

CSS

.contents {
  width: 200px;
  height: 100px;
  border: 1px solid black;

}

JavaScript

function check_height(ele) {
let styleHeight = +getComputedStyle(ele).getPropertyValue('height').slice(0,-2);
alert(ele.scrollHeight > styleHeight);
}
check_height(document.querySelector('div'));