The width of the top border of an element in pixels. It is a read-only, integer property of element.
As it happens, all that lies between the two locations (
offsetTop and client area top) is the element's border. This is because the
offsetTop indicates the location of the top of the border (not the margin) while the client area starts immediately below the border, (client area includes padding.) Therefore, the clientTop value will always equal the integer portion of the
.getComputedStyle() value for "border-top-width". (Actually might be Math.round(parseFloat()).) For example, if the computed "border-top-width" is zero, then
clientTop is also zero.
Note: This property will round the value to an integer. If you need a fractional value, use