javascript.info
javascript.info are an excellent source of JavaScript and other web-based development information. They appear to be based out of Russia.
I have added javascript.info to my list of resources that I have found useful. The screenshot above (modified to show that it was updated within days of me starting this page) shows part of the page that I was quoting from.
javascript.info approaches the whole subject of web-design in a far more prescriptive manner than do I. This is evident in the attention to detail with respect to variable scope and syntax in general
The Prescriptive aspects
This came to my attention when looking more closely at their tutorial. The use of "use strict" and the assignment of variables using a "let" statement.
The "circular" nature of comments
The discussion on the javascript.info page on Bubbling and Capturing is good but it shows the danger of having comments that an example should be changed. If the change was made then the viewer is potentially confused. The comment, if the change was a vilid one, may have resulted in a change that makes the comment irrelevant and confusing.
This why I have little desire to implement such a comment system.