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Documentation and tutorials

CSS key concepts

Describes the syntax and forms of the language and introduces fundamentals like specificity and inheritance, the box model and margin collapsing, stacking and block-formatting contexts, or the initial, computed, used and actual values. Entities like CSS shorthand properties are also defined.

CSS developer guide

Articles to help you learn CSS techniques to make your content shine.

Tools for CSS development

• The W3C CSS Validation Service checks if a given CSS is valid. It is an invaluable debugging tool.
• Firefox' Firebug extension, a popular extension of that navigator that allows to edit live CSS on watched sites. Very practical to test some changes, though this extension does much more.
• Firefox' Web Developer extension also allows to watch and edit live CSS on watched sites. Simpler than Firebug, though less powerful.
• Firefox' EditCSS extension allows editing CSS in the sidebar.

Related Topics

• Mozilla Learn CSS resources.
• Open Web languages on which CSS is often applied: HTML, SVG, XHTML, XML.
• Mozilla technologies which make extensive use of CSS: XUL, Firefox and Thunderbird extensions and themes.

News

• CSS Text-decoration Level 3 reached the Candidate Recommandation status, defining that the text-decoration-* and text-emphasis-* properties. The long known text-shadow is also defined in it. (August 1st, 2013)
• Gecko's now support background-origin: local. It will be available from Firefox 25 (and already is in Nightly). (July 25th, 2013)
• Pointer Events reached the Candidate Recommandation status, meaning that the CSS property touch-action, currently only implemented in IE10 (with the -ms- prefix), is no more experimental. (May 6th, 2013)
• Gecko's support of flexible boxes has been adapted to match a recent specification clarification: from Firefox 23 ::before and ::after will be flex items, and as such can be repositioned using order and align-self. (May 3rd, 2013)

Getting help

You need help on a CSS-related problem and can't find the solution in the documentation?

• Check the common CSS questions that give hints to solve common CSS problems.
• Go to Stack Overflow, a collaboratively built and maintained Q&A site and look if you can find the answer to your question. If not you will be able to ask your question there.
• Consult the layout forum, which covers CSS and HTML:
  • Mailing list
  • Google Group
  • RSS feed
  • Ask your question on the Mozilla IRC channel: #css
  • Ask your question on the CSS-Discuss site and list