Clarify or remove note on units of related browsing contexts and units of related similar-origin browsing contexts

[j9t]

7.1.4 features the following note:

The HTML Standard used to define "unit of related browsing contexts" and "unit of related similar-origin browsing contexts". These have been removed as they were not adequate.

This leaves readers hanging:

• If this is important, what are the definitions, or where could one find them (link, even to the “not adequate” definitions)?
• If these are not important, why bother mentioning these?

(If these are not relevant, I’m happy to submit a PR taking out the note.)

[domenic]

The main point of this note is to have something for https://whatwg.org/working-mode#anchors . It's not really that important to give people an explanation of these obsolete concepts; if they want that they can find the relevant PRs and issues.

[j9t]

Thanks for clarifying. (Just calling it out, that seems process-focused, but not user-focused.)

If this must stay to serve the internal link requirement, how about giving the user something to work with, like providing adequate definitions, showing the inadequate definitions (readers will understand if this is accompanied by a note), or linking to a previous revision?

[domenic]

I don't think that's necessary, as I said above. It's best if readers without the necessary context just ignore these.

[annevk]

I think acknowledging these existed and are obsolete serves a purpose for users of the specification. If they come across these terms in software and look them up they will realize they will have to adjust things. Same as if you are looking up bgsound and find out it does close-to-nothing.