how to get the width of the divin javascript code example

Example 1: javascript get width of a div

document.getElementById("mydiv").offsetWidth

Example 2: get width of a dom element js

// Get Content + Padding + Border
let box = document.querySelector('div');
let width = box.offsetWidth;
let height = box.offsetHeight;

// Get Content + Padding only
let box = document.querySelector('div');
let width = box.clientWidth;
let height = box.clientHeight;