The HTML Model

Making HTML Dance The Document Object model was originally designed to let Web developers create 'dynamic' HTML Web pages.
Interface and Presentation Dynamic HTML goes well beyond 'ordinary' HTML in mixing presentation and content, adding scripted activity to documents on an ad hoc basis. 'No element is safe'.
A common understanding of scripts XML has no standards whatsoever for identifying scripts inside of documents. There are several possibilities - style sheets, XLink roles, and processing instructions among them - but no standard that works across XML vocabularies.
A weak beginning? While dynamic HTML opens lots of new interface possibilities, violent incompatibilities between browsers and general complexity have frustrated efforts to make HTML dynamic in a wide sense.