var width = document.getElementById('myID').offsetWidth;//includes margin,border,padding
var height = document.getElementById('myID'). offsetHeight;//includes margin,border,padding
//includes margin and padding
document.getElementById('myDiv').offsetHeight;
//without margin and padding
document.getElementById('myDiv').clientHeight;
document.getElementById("myBtn").style.height = "50px";
var intElemOffsetHeight = element.offsetHeight;