Notifications API and Permission Handling

Notification.permission is a static string that reflects the current permission state. It can be "granted" (user allowed), "denied" (user blocked), or "default" (never asked). Check this property before trying to show notifications to avoid unnecessary errors.

Notification.requestPermission() returns a Promise that resolves with the new permission string. Call it only in response to a clear user action, not on page load. Browsers ignore or suppress permission prompts that fire immediately on load, and users find them annoying when they appear without context.