Screen: isExtended property
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.
The isExtended read-only property of the
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 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
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| Window Management # api-screen-isExtended-attribute |
Browser compatibility
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isExtended
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Legend
Tip: you can click/tap on a cell for more information.
- Full support
- Full support
- No support
- No support
- Experimental. Expect behavior to change in the future.