Compatible visual area height and width

function viewwidth () {    return window.innerwidth | | document.documentElement.clientWidth;} function viewheight () {    return window.innerheight | | document.documentElement.clientHeight;}

Document.body.clientWidth ==> Body Object width
Document.body.clientHeight ==> Body Object Height
Document.documentElement.clientWidth ==> Visible Area width
Document.documentElement.clientHeight ==> Visible Area height

Innerwidth&innerheight

A read-only property that declares the height and width of the window's document display, measured in pixels.
The width and height do not include the height of the menu bar, toolbars, and scroll bars.

Compatible visual area height and width