The values of HTML are not exactly the ones of HTML first.
https://html-first.com/

The author recommends to include instead:

• HTML that is actual HTML, i.e., that is valid (common sense, until you start checking)
• HTML that makes full use of HTML features, i.e., that’s not XHTML–HTML
• HTML that is used according to purpose (aka semantic HTML)
• HTML that is accessible

#futurBilletDeBlog
#idea #browserExtension a view source with automatic indentation