clientTop property

The property clientTop contains the width of the top border (border-top value).

Syntax

element.clientTop;

Let's find out the width of the top border of an element:

<div id="elem"></div>

#elem {
	width: 100px;
	height: 100px;
	border: 10px solid black;
}

let elem = document.querySelector('#elem');
console.log(elem.clientTop);

The code execution result:

10