HTML5: Edition for Web Authors

Question

I am stressed out because of lack of clarification and further guidance on the matter from W3. On this link: HTML5: Edition for Web Authors

They state:

This document has been discontinued and is only made available for historical purposes. The HTML specification includes a style switcher that will hide implementer-oriented content.

Why is this so? Where can I find the newest edition? Is there even a new edition of this, or am I forced to use edition with user-agent (UA) implementation details?

Answer 1

Click the link in the quote to view the HTML Spec. Then, click the button in the top right to turn on developer styles:

That is the "style switcher" referred to in the quote.