First Public Working Draft: CSS Environment Variables Module Level 1

CSS Environment Variables Module Level 1

https://www.w3.org/TR/2025/WD-css-env-1-20250923/

Published by
 Cascading Style Sheets (CSS) Working Group

Abstract

This specification defines the concept of environment variables and the env() function, which work similarly to custom properties and the var() function, but are defined globally for a document. These can be defined either by the user agent, providing values that can be used on the page based on information the UA has special access to, or provided by the author for "global" variables that are guaranteed to be the same no matter where in the document they’re used.  CSS is a language for describing the rendering of structured documents (such as HTML and XML) on screen, on paper, etc.

Status of the Document

This section describes the status of this document at the time of its publication. A list of current W3C publications and the latest revision of this technical report can be found in the W3C standards and drafts index. 

This document was published by the CSS Working Group as a First Public Working Draft using the Recommendation track. Publication as a First Public Working Draft does not imply endorsement by W3C and its Members. 

This is a draft document and may be updated, replaced or obsoleted by other documents at any time. It is inappropriate to cite this document as other than a work in progress. 

Please send feedback by filing issues in GitHub (preferred), including the spec code “css-env” in the title, like this: “[css-env] …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. 

This document was produced by a group operating under the W3C Patent Policy. W3C maintains a public list of any patent disclosures made in connection with the deliverables of the group; that page also includes instructions for disclosing a patent. An individual who has actual knowledge of a patent that the individual believes contains Essential Claim(s) must disclose the information in accordance with section 6 of the W3C Patent Policy.

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Received on Tuesday, 23 September 2025 09:08:02 UTC