If you write CSS for a living, it is important to understand how to write valid CSS property values correctly. Once you understand how different values can be combined or multiplied, the CSS property value syntax becomes much easier to comprehend. The following syntax can be hard to understand if you don’t know the various symbols and how they work. However, it is worth taking the time to learn. I
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Published on Dec 5, 2013 (updated Feb 5, 2024), filed under development, css, html. (Share this post, e.g. on Mastodon or on Bluesky.) This and 133 other posts are also available as a well-behaved ebook: On Web Development. We have not one but two fundamental problems with CSS. One is unrestricted growth and complexity leading to poor understanding and poor code. Another one is spec fragmentation,
CSS Basic User Interface Module Level 4 W3C Working Draft, 16 March 2021 This version: https://www.w3.org/TR/2021/WD-css-ui-4-20210316/ Latest published version: https://www.w3.org/TR/css-ui-4/ Editor's Draft: https://drafts.csswg.org/css-ui-4/ Previous Versions: https://www.w3.org/TR/2020/WD-css-ui-4-20200124/ https://www.w3.org/TR/2020/WD-css-ui-4-20200102/ https://www.w3.org/TR/2017/WD-css-ui-4
CSS Syntax Module Level 3 W3C Candidate Recommendation Draft, 24 December 2021 More details about this document This version: https://www.w3.org/TR/2021/CRD-css-syntax-3-20211224/ Latest published version: https://www.w3.org/TR/css-syntax-3/ Editor's Draft: https://drafts.csswg.org/css-syntax/ Previous Versions: https://www.w3.org/TR/2019/CR-css-syntax-3-20190716/ https://www.w3.org/TR/2014/CR-css
W3C Working Group Note 12 May 2011 This version: http://www.w3.org/TR/2011/NOTE-css-2010-20110512/ Latest version: http://www.w3.org/TR/css-2010/ Previous versions: http://www.w3.org/TR/2010/WD-css-2010-20101202/ Editor: Elika J. Etemad Copyright © 2011 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C liability, trademark and document use rules apply. Abstract This document collects together into
CSS Multi-column Layout Module Level 1 W3C Candidate Recommendation Snapshot, 16 May 2024 More details about this document This version: https://www.w3.org/TR/2024/CR-css-multicol-1-20240516/ Latest published version: https://www.w3.org/TR/css-multicol-1/ Editor's Draft: https://drafts.csswg.org/css-multicol/ History: https://www.w3.org/standards/history/css-multicol-1/ Implementation Report: http
CSS Grid Layout Module Level 1 W3C Candidate Recommendation Draft, 26 March 2025 More details about this document This version: https://www.w3.org/TR/2025/CRD-css-grid-1-20250326/ Latest published version: https://www.w3.org/TR/css-grid-1/ Editor's Draft: https://drafts.csswg.org/css-grid-1/ History: https://www.w3.org/standards/history/css-grid-1/ Implementation Report: https://wpt.fyi/results/cs
CSS Template Layout Module W3C Working Group Note 26 March 2015 This version: http://www.w3.org/TR/2015/NOTE-css-template-3-20150326/ Latest version: http://www.w3.org/TR/css-template-3/ Previous version: http://www.w3.org/TR/2011/WD-css3-layout-20111129/ Feedback: www-style@w3.org with subject line “[css-template-3] … message topic …” (archives) Editors: Bert Bos (W3C) bert@w3.org César Acebal (U
CSS Flexible Box Layout Module Level 1 W3C Candidate Recommendation Draft, 14 October 2025 More details about this document This version: https://www.w3.org/TR/2025/CRD-css-flexbox-1-20251014/ Latest published version: https://www.w3.org/TR/css-flexbox-1/ Editor's Draft: https://drafts.csswg.org/css-flexbox/ History: https://www.w3.org/standards/history/css-flexbox-1/ Implementation Report: https:
CSS specifications This page contains a list of all completed specifications and drafts by the CSS WG. If you want to follow the development of CSS, this is the place to start. You have ideas? Contributions? See ‘If you want to help’ on this page. A specification is not a manual. There is no excuse for badly written drafts and please complain if you find one. But specs do target a specific aud
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