Document Declarative Web Push

[annevk]

Declarative Web Push is a new feature that allows push messages to bypass the service worker and directly trigger an end user notification. This is beneficial to battery life and overall more robust as service workers are subject to storage limits.

This feature involves changes across W3C's Push API, WHATWG's Notifications API, and W3C's Badging API.

It is tracked here w3c/push-api#360 and I will add a comment to that issue summarizing the changes to the various standards.

[Josh-Cena]

@annevk for bigger projects like this, you may prefer to use https://github.com/mdn/mdn, since the content issues are for granular, actionable items that affect only one or a few pages.

[annevk]

If the guidance in https://github.com/whatwg/meta/blob/main/MAINTAINERS.md needs to be updated, it might be best to file an issue against that repository so everyone is on the same page.