onlineSignal

Reports the browser's online status as a readonly signal. The initial value comes from navigator.onLine, and the signal updates when the window receives an online or offline event.

• true: the browser reports that it is online.
• false: the browser reports that it is offline.
• undefined: the status is unknown, such as during server rendering when window or navigator is unavailable, or when navigator.onLine is not supported.

Observing the browser's online status

StackBlitz

Demo TypeScript HTML

Browser status: Unknown (undefined)

Go offline by disabling wifi or using developer tools to see the status change.