I have recently had time to focus on studies. I downloaded a number of the ISO standards and worked through putting the standard into practice. I have recently been walking ECMAScript (JavaScript) and C#. It is interesting comparing the actual standard with some of the shortcuts which have been taken. I noticed that the concept of deprecation seems to be lost on a lot of folks.
A deprecated element of a specification does not mean “QUICK! Use it while we still can!” it means plan for removal because it will soon be obsolete. Having said that I find that my web pages usually end up conforming to the loose.dtd as opposed to the strict.dtd.
I will post some of my findings on language deltas to theis page as I finish my discovery.