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Web Design 1011:  Interoperability, Accessibility, Compliance, & Branding.    

Web Design Validation

In spite of key differences in mark-up interpretation implemented by browser engines, deploying only compliant mark-up is the best solution at hand for the remaining "unexploded shells" of the "browser wars". You can validate your mark-up @:

http://validator.w3.org for SGML, HTML, and XHTML
http://jigsaw.w3.org/css-validator/ for CSS

It isn't just web browsers that visit your site. Brail readers, and page readers are also significant visitors, and one of the most common validation errors is the lack of the "alt" attribute applied to image element. The "alt" attribute describes the picture for someone who is visually impaired, is read by the page/brail reader and also by the search engine spiders. The "title" attribute of the image element, on the other hand, is not a compliance requirement, but can used to carry the meaning, intention, or analysis of the image, which is displayed on mouse-over as a tool-tip for sighted visitors seeking more information. Title attributes are also read by the search engine spiders, so pay attention to these.

Other common errors include the lack of a document type statement (either ignorance or in the case of professional web developers, incompetence), lack of title element, use of discontinued font elements, and assorted misapplication of attributes to elements.

Compliance errors don't just bug the validator. They can and do cause unexpected and unpredictable behaviour that will change arbitrarily with time and browser upgrades. As you can see from the badges below, the World Wide Web Consortium offers validation services that are second to none. You can use them to ensure predictable long term page behaviour, or we can design compliant pages with long term functionality for you.