W3cubDocs

/DOM

CSS Object Model

The CSS Object Model is a set of APIs allowing the manipulation of CSS from JavaScript. It is much like the DOM, but for the CSS rather than the HTML. It allows users to read and modify CSS style dynamically.

Reference

Several other interfaces are also extended by the CSSOM-related specifications: Document, Window, Element, HTMLElement, HTMLImageElement, Range, MouseEvent, and SVGElement.

CSS Typed Object Model

This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

Obsolete CSSOM interfaces

Obsolete
This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.

Tutorials

Determining the dimensions of elements (it needs some updating as it was made in the DHTML/Ajax era).
Managing screen orientation

Specifications

Specification	Status	Comment
CSS Typed OM Level 1	Working Draft
CSS Painting API Level 1	Working Draft	Extended the `CSS` interface with the `paintWorklet` static property.
CSS Object Model (CSSOM) View Module	Working Draft	Defined the `Screen` and `MediaQueryList` interfaces and the `MediaQueryListEvent` event and `MediaQueryListListener` event listener.
CSS Object Model (CSSOM)	Working Draft	Extended the `CSS` interface and provides the base for the modern CSSOM specification.
Screen Orientation API	Working Draft
CSS Fonts Module Level 3	Candidate Recommendation
CSS Animations	Working Draft
CSS Transitions	Working Draft
CSS Custom Properties for Cascading Variables Module Level 1	Candidate Recommendation
CSS Conditional Rules Module Level 3	Candidate Recommendation	Defined the `CSS` interface.
CSS Device Adaptation	Working Draft
CSS Counter Styles Level 3	Candidate Recommendation
Document Object Model (DOM) Level 2 Style Specification	Obsolete	Initial definition.

Browser compatibility

All these features have been added little by little over the years to the different browsers: it was a quite complex process that can't be summarized in a simple table. Please refer to the specific interfaces for its availability.