ScreenDetailed: isPrimary property

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 isPrimary read-only property of the ScreenDetailed interface is a boolean indicating whether the screen is set as the operating system (OS) primary screen or not.

The OS hosting the browser will have one primary screen, and one or more secondary screens. The primary screen can usually be specified by the user via OS settings, and generally contains OS UI features such as the taskbar/icon dock. The primary screen may change for a number of reasons, such as a screen being unplugged.


A boolean value — true if the screen is primary, and false if it is secondary.


const screenDetails = await window.getScreenDetails();

// Is the first screen primary?
const screen1Primary = screenDetails.screens[0].isPrimary;


Window Management
# ref-for-dom-screendetailed-isprimary

Browser compatibility

BCD tables only load in the browser

See also