Any reason why you couldn't instead have an optional drop-in Shim that allows developers to use the current/modern HTML5 Notifications API syntax, where the shi

Any reason why you couldn't instead have an optional drop-in Shim that allows developers to use the current/modern HTML5 Notifications API syntax, where the shim simply adds supports to older/other browsers? I hate introducing additional APIs if it's not necessary. In the future when the browsers you care about support the Notifications API it's easiest to simply remove the shim.