When will you mark outdated information consistently?
I have noticed that you (and other sites) are presenting some information that is now outdated. Sometimes you point that out but, as with the use of appearance commands in HTML, you don't note anything. It would be valuable to know if something is really new (like only valid on ES6), newer (like valid on HTML 5 but not earlier), or old enough that we should know it but might never use it (like framesets from HTML4, which you pointed out aren't usable in HTML5), and so on. I realize that this will require some work on the part of your devs, but it is important. You could make it easier by having some sort of system that shows this sort of compatibility built into each tidbit you teach, so all you'd have to do is switch a flag's value or add new information. For example: var stillValid=false; var validInVersions=`ES6`; var supported="The <frame> tag is not supported in HTML5." And so on...