CSS: Folhas de Estilo em Cascata

Tutoriais

A nossa Área de Aprendizagem de CSS apresenta múltiplos módulos que ensinam CSS desde o início  — não é necessário conhecimento prévio.

Introdução ao CSS

This module gets you started with the basics of how CSS works, including selectors and properties, writing CSS rules, applying CSS to HTML, how to specify length, color, and other units in CSS, cascade and inheritance, box model basics, and debugging CSS.

Estilizar texto

Here we look at text styling fundamentals, including setting font, boldness, and italics, line and letter spacing, and drop shadows and other text features. We round off the module by looking at applying custom fonts to your page, and styling lists and links.

Estilizar caixas

Next up, we look at styling boxes, one of the fundamental steps towards laying out a web page. In this module we recap the box model then look at controlling box layouts by setting padding, borders and margins, setting custom background colors, images and other features, and fancy features such drop shadows and filters on boxes.

Disposição de CSS (layout)

At this point we've already looked at CSS fundamentals, how to style text, and how to style and manipulate the boxes that your content sits inside. Now it's time to look at how to place your boxes in the right place in relation to the viewport, and one another. We have covered the necessary prerequisites so you can now dive deep into CSS layout, looking at different display settings, traditional layout methods involving float and positioning, and new fangled layout tools like flexbox.

Referência

• CSS - Referência: This exhaustive reference for seasoned Web developers describes every property and concept of CSS.
• CSS key concepts:
  • The syntax and forms of the language
  • Specificity, inheritance and the Cascade
  • Box model and margin collapse
  • The containing block
  • Stacking and block-formatting contexts
  • Initial, computed, used, and actual values
  • CSS shorthand properties
  • CSS Flexible Box Layout
  • CSS Grid Layout
  • Media queries

Cookbook

The CSS layout cookbook aims to bring together recipes for common layout patterns, things you might need to implement in your own sites. In addition to providing code you can use as a starting point in your projects, these recipes highlight the different ways layout specifications can be used, and the choices you can make as a developer.

Ferramentas para o desenvolvimento de CSS

• You can use the W3C CSS Validation Service to check if your CSS is valid. This is an invaluable debugging tool.
• Firefox Developer Tools lets you view and edit a page's live CSS via the Inspector and Style Editor tools.
• The Web Developer extension for Firefox lets you track and edit live CSS on watched sites.
• The Web community has created various other miscellaneous CSS tools for you to use.

Erros de metadados

• Firefox: bug 1323667