Test element in JavaScript

Let's create a test element to study various metrics in the following lessons. We design this element so that it has borders, padding, and scrollbars:

<div id="elem">
	some long text
</div>

#elem {
	width: 300px;
	height: 150px;
	margin: 50px auto;
	padding: 25px;
	background: #CFF5BF;
	border: 25px solid #F0D7A1;
	overflow: auto;
	text-align: justify;
}

Let's get a reference to this element into a variable:

let elem = document.querySelector('#elem');

Make a similar test element for yourself. Check on it the properties that will be studied in the following lessons.