Ari Stathopoulos

As a sidenote, it would also allow for background-compatibility for non-FSE themes that would want to migrate to FSE... So if twentytwenty for example wanted to be an FSE theme...

> It is [recommended](https://webaim.org/techniques/semanticstructure/#headings) to start the main content with `` for better accessibility. +1 > Also, the [accessibility requirements](https://make.wordpress.org/themes/handbook/review/accessibility/required/#headings) require themes to have no more than one `` tag...

@dmsnell > Our own WordPress coding standards demand at least one unfortunate code pattern in the name of performance based on a misunderstanding how modern CPUs work. Could you please...

The above implementation seems reasonable and safe. I think using a nonce as "security key" would be a necessary precaution, just to be on the safe side of things and...

Will this have an impact on the SQLite implementation? 🤔

> Run some profiles, before and after, the results, are sadly not promising. Not quite... 😄 The numbers on the screenshots above point out something interesting: PHP time is increased...

Hey @lkraav! The implementation here is complete, and the autoloader works as expected. I haven't seen anything "blow up"... Once/week I rebase the PR and update it, pulling the latest...

> I'd like to stay in at least release candidate stability, but I guess this branch is constantly moving with trunk? Yeah, I'm keeping it up to date with trunk...

@spacedmonkey thank you for the additional notes! 👍 > This file will need to be broken up into multiple files. > https://github.com/WordPress/WordPress/blob/10838cb5a009a95de13fa4d2f50afabcb7ca26c7/wp-includes/class-wp-block-parser.php I already have a track ticket for that...

> @aristath That change was big a deal. See profiles Nice!! So basically the autoloader now improves loading time, CPU time, and memory consumption all in one 🎉