Feature request: IndieWebify should support h-feed validation

[tantek]

Similar to its h-entry checking support (validator), IndieWebify should support parsing, checking, and advising how to improve your h-feed (https://microformats.org/wiki/h-feed), ideally re-using the existing h-entry checking code to also validate all h-entry items found inside the h-feed.

(Originally published at: https://tantek.com/2024/187/b1/indiewebify-request-h-feed-validation)