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Changes between Initial Version and Version 1 of Ticket #63499, comment 3

initial	v1
1		Block themes typically do not have the `header.php` and `footer.php` templates, which makes them default to the `theme-compat` files. If #55023 can create the header and footer from the theme, that would be a better way to fix this.
	1	Block themes typically do not have the `header.php` and `footer.php` templates, which makes them default to the `wp-includes/theme-compat` files. If #55023 can create the header and footer from the theme, that would be a better way to fix this.
2	2
3	3	If the `theme-compat` header and footer are centered at 90% width, the styles would need to make sure it only applies with the `theme-compat` markup. Many classic themes could have elements with [https://wpdirectory.net/search/01JWBJQYE5AFK45CVY8WFYXW0X #header] or [https://wpdirectory.net/search/01JWBKXHFTFBFJSWC9GBSKJQJQ #footer], and at least Twenty Ten's header should not be set to 90%.