hubcap offline

Enable or disable the browser’s offline mode.

When to use

Simulate a complete network disconnection to test how a page behaves when offline, such as verifying service worker caching or offline fallback UI. Use throttle for slow-but-connected simulation rather than a full disconnect.

Usage

hubcap offline <true|false>

Arguments

Argument	Type	Required	Description
`value`	boolean	Yes	`true` to enable offline mode, `false` to disable it

Flags

None.

Output

Field	Type	Description
`offline`	boolean	Whether offline mode is now active

{"offline":true}

Errors

Condition	Exit code	Stderr
Missing argument	1	`usage: hubcap offline <true\\|false>`
Invalid argument	1	`error: invalid value, use 'true' or 'false'`
Chrome not connected	2	`error: connecting to Chrome: ...`
Timeout	3	`error: timeout`

Examples

Go offline:

hubcap offline true

Restore connectivity:

hubcap offline false

Go offline, reload the page, and check that the service worker serves cached content:

hubcap offline true && hubcap reload && hubcap waitload && hubcap text "#status"