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Using dynamic styling information

The CSS Object Model (CSSOM), part of the DOM, exposes specific interfaces allowing manipulation of a wide amount of information regarding CSS. Initially defined in the DOM Level 2 Style recommendation, these interfaces forms now a specification, CSS Object Model (CSSOM) which aims at superseding it.
beginner Beginner CSSOM NeedsBeginnerUpdate

Locating DOM elements using selectors

The Selectors API provides methods that make it quick and easy to retrieve Element nodes from the DOM by matching against a set of selectors. This is much faster than past techniques, wherein it was necessary to, for example, use a loop in JavaScript code to locate the specific items you needed to find.
Beginner DOM Firefox 3.5 NeedsBeginnerUpdate

DOM on-event handlers

The Web platform provides several ways to get notified of DOM events.  Two common styles are: the generalized addEventListener() and a set of specific on-event handlers. This page focuses on the details of how the latter work.
beginner Beginner DOM NeedsBeginnerUpdate NeedsUpdate

Block formatting context

A block formatting context is a part of a visual CSS rendering of a Web page. It is the region in which the layout of block boxes occurs and in which floats interact with each other.
Beginner CSS CSS Basic Concepts Guide NeedsBeginnerUpdate NeedsExample Web