window.screen

Returns a reference to the screen object associated with the window. The screen object, implementing the Screen interface, is a special object for inspecting properties of the screen on which the current window is being rendered.

Syntax

screenObj = window.screen;

Example

if (screen.pixelDepth < 8) {
  // use low-color version of page
} else { 
  // use regular, colorful page
}

Specification