Demo: width(), innerWidth(), outerWidth() and outerWidth(ture) methods:
Div Dimensions:
width = 300px
padding = 30px all sides
border = 5px all sides
margin = 20px all sides
Ouput
width() =
innerWidth() =
outerWidth() =
outerWidth(true) =
width()
innerWidth()
outerWidth()
outerWidth(true)