Support for the NotificationOptions.requireInteraction property, letting authors hint that a notification should remain readily available until the user clicks or dismisses it. When omitted, Chrome desktop will start to close* notifications after ~20 seconds (rather than the toast remaining permanently on-screen); Chrome for Android will be unaffected, since the platform requires that notifications are always minimized there. *Chrome OS only - auto-minimize to the notification center.
Docs: https://developer.mozilla.org/en-US/docs/Web/API/notification/Notification https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorkerRegistration/showNotification
Samples: https://googlechrome.github.io/samples/notifications/requireInteraction.html