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Aprender um pouco de HTML, CSS e JavaScript é útil se quiser tornar-se em um desenvolvedor da web, mas o seu conhecimento precisa de ir mais além do que apenas utilizar as tecnologias - precisa de as utilizar com responsabilidade para maximizar o público dos seus sites da web e não impedir que as utilizem. Para conseguir isso, precisa de aderir às melhores práticas gerais (que são demonstradas através dos tópicos de HTML, CSS, e JavaScript), efetuar teste cruzado de navegador, e considerar a acessibilidade desde o início. Neste módulo, nós iremos abordar o último em detalhes.


To get the most out of this module, it would be a good idea to either work through at least the first two modules of the HTML, CSS, and JavaScript topics, or perhaps even better, work through the relevant parts of the accessibility module as you work through the related technology topics.

Note: If you are working on a computer/tablet/other device where you don't have the ability to create your own files, you can try out most of the code examples in an online coding program such as JSBin or Thimble.


What is accessibility?
This article starts the module off with a good look at what accessibility actually is — this includes what groups of people we need to consider and why, what tools different people use to interact with the web, and how we can make accessibility part of our web development workflow.
HTML: A good basis for accessibility
A great deal of web content can be made accessible just by making sure the correct HTML elements are used for the correct purpose at all times. This article looks in detail at how HTML can be used to ensure maximum accessibility.
CSS and JavaScript accessibility best practices
CSS and JavaScript, when used properly, also have the potential to allow for accessible web experiences, but if misused they can significantly harm accessibility. This article outlines some CSS and JavaScript best practices that should be considered to ensure that even complex content is as accessible as possible.
WAI-ARIA basics
Following on from the previous article, sometimes making complex UI controls that involve unsemantic HTML and dynamic JavaScript-updated content can be difficult. WAI-ARIA is a technology that can help with such problems by adding in further semantics that browsers and assistive technologies can recognize and use to let users know what is going on. Here we'll show how to use it at a basic level to improve accessiblity.
Accessible multimedia
Another category of content that can create accessibility problems is multimedia — video, audio, and image content need to be given proper textual alternatives so they can be understood by assistive technologies and their users. This article shows how.
Mobile accessibility
With web access on mobile devices being so popular, and popular platforms such as iOS and Android having fully-fledged accessibility tools, it is important to consider the accessibility of your web content on these plartforms. This article looks at mobile-specific accessibility considerations.


Accessibility troubleshooting
In the assessment for this module, we present to you a simple site with a number of accessibility issues that you need to diagnose and fix.

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