var width = document.getElementById('myID').offsetWidth;//includes margin,border,padding
var height = document.getElementById('myID'). offsetHeight;//includes margin,border,padding// 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;document.getElementById("myElID").style.width = "100px";int screenHeight = screenSize.height;
int screenWidth = screenSize.width;getComputedStyle(element).width; //returns value in px like "727.7px"