How to get the position of an element relative to the document in JavaScript

In this Article we will go through how to get the position of an element relative to the document only using single line of code in JavaScript. This is a one-line JavaScript code snippet that uses one of the most popular ES6 features => Arrow Function.

Let's define this short function:

const getPosition = ele => (r = ele.getBoundingClientRect(), { left: r.left + window.scrollX, top: r.top + window.scrollY });

getPosition(document.body);     // { left: 0, top: 0 }