Screen: isExtended property

{{APIRef("Window Management API")}}{{SeeCompatTable}}{{securecontext_header}}

The isExtended read-only property of the {{domxref("Screen")}} interface returns true if the user's device has multiple screens, and false if not.

This property is typically accessed via window.screen.isExtended, and can be used to test whether multiple screens are available before attempting to create a multi-window, multi-screen layout using the Window Management API.

Value

A boolean value — true if the device has multiple screens, and false if not.

[!NOTE] If a {{httpheader("Permissions-Policy/window-management", "window-management")}} Permissions-Policy is set that blocks use the Window Management API, isExtended will always return false.

Examples

if (window.screen.isExtended) {
  // Create multi-screen window layout
} else {
  // Create single-screen window layout
}

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also

• Window Management API