jQuery .outerWidth()

Returns the width of the element, along with left and right padding, border, and optionally margin, in pixels.

If includeMargin is omitted or false, the padding and border are included in the calculation; if true, the margin is also included.

This method is not applicable to window and document objects; for these, use .width() instead. Although .outerWidth() can be used on table elements, it may give unexpected results on tables using the border-collapse: collapse CSS property.