DHTML = DOM scripting.
This article should merged with DHTML (or both should be removed). There is NO difference between the two. Dynamic HTML is not a technology, it's a marketing term invented by Microsoft. It described that the javascript in their latest browser had better access to the document than in their previous browser. All browsers have been progressively getting better at this from release to release.
More than that, the "DOM Scripting vs. DHTML" section is a load of bullshit. It seems to me the reason this article exist is to market some books, and boost the page rank of the random links at the bottom.