Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The HTTP Permissions-Policy header window-management directive controls whether or not the current document is allowed to use the Window Management API to manage windows on multiple displays.
Where this policy forbids use of the API:
Promise returned by the Window.getScreenDetails() method will reject with a NotAllowedError exception.Window.screen.isExtended property will always return false.Permissions-Policy: window-management=<allowlist>;<allowlist>A list of origins for which permission is granted to use the feature. See Permissions-Policy > Syntax for more details.
The default allowlist for window-management is self.