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Calendar Checkoff has one job: Alt-click an event—Option-click on Mac—to add or remove a checkmark from its title.

How to use it

1. Open Google Calendar in Chrome.
2. Hold Alt, or Option on a Mac.
3. Click a visible calendar event.
4. Wait a moment while Google Calendar saves the updated title.

If nothing happens

1. Refresh the Google Calendar tab after installing or updating the extension.
2. Make sure the extension is enabled and allowed on calendar.google.com.
3. Try the gesture on an event you own and can edit.
4. Close any event editor or dialog already open, then try again.

Expected limits

The extension cannot edit read-only calendars or events you do not have permission to change. Google Calendar’s interface also changes from time to time; if the gesture stops working after a Calendar update, check the Chrome Web Store listing for an extension update.