Accessibility
Imagine surfing the web when you can't see the web.
The percentage of internet users with disabilities is growing as new technologies make the web experience richer, more intuitive, and friendly. However, these technologies rely on web authors to write well-ordered, valid code. They interpret this code in a variety of ways and customize the presentation to the client.
These technologies may remove style sheets, images, and color, increase text size, or display the site with extra large text on a high contrast scheme. Other software packages will read your site to the client, using different voices for links and image descriptions. Is your site capable of adapting it's content?
This site, for example, is written so that the content is in a logical order. The main content (this section you are reading now) actually comes first. The navigation links come next, followed by the footer. On your screen, reading from left to right, the navigation comes first, followed by the main content. The difference is that a screen reader, or text browser gets straight to the content, the links to other pages, follow the content in a natural logic flow - read a page and move on to the next page.
Valid code, using html for the content and separating all style (color, fonts, backgrounds, borders etc.) to a separate sheet (a cascading style sheet) is key to making this work and "out-of-the-box" software can't give you that. On most browsers, you can select View then Source if you would like to see the inner workings.
Ultimately, a web site written this way, recognizes the needs of all internet users, and ensures that any user who finds our site, is welcome, and is able to access all the content.
That's accessibility. That's what you'll get from UNSPUN.CA