get white pixels in javascript code example

Example 1: javascript get element width

var width = document.getElementById('myID').offsetWidth;//includes margin,border,padding
var height = document.getElementById('myID'). offsetHeight;//includes margin,border,padding

Example 2: javascript get image dimensions

var img = document.getElementById("myImageID"); 
var imgWidth = img.clientWidth;
var imgHeight = img.clientHeight;