CSS Object Model (CSSOM) Module Level 1

Editor’s Draft,

More details about this document
This version:
https://drafts.csswg.org/cssom/
Latest published version:
https://www.w3.org/TR/cssom-1/
Previous Versions:
Feedback:
CSSWG Issues Repository
Inline In Spec
Editor:
(Mozilla)
Former Editors:
(Disruptive Innovations)
(Opera Software AS)
Glenn Adams (Cox Communications, Inc.)
Anne van Kesteren (Opera Software ASA)
Suggest an Edit for this Spec:
GitHub Editor
Legacy issues list:
Bugzilla
Test Suite:
https://wpt.fyi/results/css/cssom/

Copyright © 2026 World Wide Web Consortium. W3C® liability, trademark and permissive document license rules apply.

Abstract

CSSOM defines APIs (including generic parsing and serialization rules) for Media Queries, Selectors, and of course CSS itself.

CSS is a language for describing the rendering of structured documents (such as HTML and XML) on screen, on paper, etc.

Status of this document

This is a public copy of the editors’ draft. It is provided for discussion only and may change at any moment. Its publication here does not imply endorsement of its contents by W3C. Don’t cite this document other than as work in progress.

Please send feedback by filing issues in GitHub (preferred), including the spec code “cssom” in the title, like this: “[cssom] …summary of comment…”. All issues and comments are archived. Alternately, feedback can be sent to the (archived) public mailing list www-style@w3.org.

This document is governed by the 18 August 2025 W3C Process Document.