Overview
The development of CSS Level 3 (CSS3) started in 2005. In contrast to earlier CSS specifications, CSS3 is modularized [1]. It is described by separate documents such as the modules Selectors, Media Queries, Text, Backgrounds and Borders, Colors, 2D Transformations, 3D Transformations, Transitions, Animations, and Multi-Columns (Table 1).
| Module | Last Update | Upcoming |
|---|---|---|
| Proposed Recommendation(?) | ||
| Selectors (Complete) | 15 Dec 09 | REC |
| CSS Color (Complete) | 28 Oct 10 | REC |
| Candidate Recommendation (?) | ||
| CSS Namespaces (High Priority) | 23 May 08 | PR |
| CSS Backgrounds & Borders (High Priority) | 15 Feb 11 | PR |
| CSS Multi-column Layout (High Priority) | 17 Dec 09 | PR |
| Media Queries (High Priority) | 27 Jul 10 | PR |
| CSS Marquee (Medium Priority) | 05 Dec 08 | PR |
| CSS Ruby (Medium Priority) | 14 May 03 | WD |
| CSS Basic User Interface (Medium Priority) | 11 May 04 | PR |
| CSS Style Attributes (Medium Priority) | 21 Oct 10 | PR |
| Last Call (?) | ||
| CSS Paged Media (Medium Priority) | 10 Oct 06 | CR |
| Working Draft (?) | ||
| CSS Values & Units (Medium Priority) | 19 Sep 06 | WD |
| CSS Cascading & Inheritance (Medium Priority) | 15 Dec 05 | WD |
| CSS Text (Medium Priority) | 15 Feb 11 | WD |
| CSS Writing Modes (Medium Priority) | 01 Feb 11 | WD |
| CSS Generated Content for Paged Media (Medium Priority) | 08 Jun 10 | WD |
| CSS Fonts (Medium Priority) | 24 Mar 11 | LC |
| CSS Basic Box Model (Medium Priority) | 09 Aug 07 | WD |
| CSS Template Layout (Medium Priority) | 29 Apr 10 | WD |
| CSS Speech (Medium Priority) | 16 Dec 04 | WD |
| CSS Grid Positioning (Medium Priority) | 05 Sep 07 | WD |
| CSS Flexible Box Layout (Medium Priority) | 22 Mar 11 | WD |
| CSS Image Values & Replaced Content (Medium Priority) | 17 Feb 11 | WD |
| CSS 2D Transformations (Medium Priority) | 01 Dec 09 | WD |
| CSS 3D Transformations (Medium Priority) | 20 Mar 09 | WD |
| CSS Transitions (Medium Priority) | 01 Dec 09 | WD |
| CSS Animations (Medium Priority) | 20 Mar 09 | WD |
| CSSOM View (Low Priority) | 04 Aug 09 | WD |
| CSS Syntax (Low Priority) | 13 Aug 03 | WD |
| CSS Lists (Low Priority) | 07 Nov 02 | WD |
| CSS Reader Media Type (Low Priority) | 24 Feb 04 | ? |
| CSS Generated & Replaced Content (Low Priority) | 14 May 03 | WD |
| CSS Line Layout (Low Priority) | 15 May 02 | WD |
| CSS Hyperlink Presentation (Low Priority) | 24 Feb 04 | WD |
| CSS Presentation Levels (Low Priority) | 13 Aug 03 | WD |
| Announced (?) | ||
| CSS Line Grid (Medium Priority) | n/a | WD |
| CSS Scoping (Medium Priority) | n/a | WD |
| CSS Grid Layout (Medium Priority) | n/a | WD |
| CSS Regions (Medium Priority) | n/a | WD |
| CSS Extended Box (Low Priority) | n/a | WD |
| CSS Object Model (Low Priority) | n/a | WD |
| CSS Tables (Low Priority) | n/a | WD |
| CSS Positioning (Low Priority) | n/a | WD |
| CSS Math (Low Priority) | n/a | WD |
| CSS Aural Style Sheets (Low Priority) | n/a | WD |
A variety of new functions and features have been introduced in CSS3 such as border-radius, box-shadow, background-origin, color declaration in HSL, HSLA and RGBA, text-shadow, text-overflow, word-wrap, box-sizing, attribute selectors, multi-column layout, Web fonts, and speech.
This document is updated frequently. Please come back later to keep up with the updates.