Syntax The general syntax for a document type declaration is: ]> In XML, the root element of the document is the first element in the document (e.g. in XHTML, the root element is html, being the first element opened and last closed). The keywords SYSTEM and PUBLIC suggest what kind of DTD it is (one [...]
Cascading Style Sheets
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Many major browsers are often tolerant of certain types of error, and may display a document successfully even if it is not syntactically correct. Certain other XML documents can also be validated if they refer to an internal or external DTD. W3C also offers validation tools for web technologies other than HTML/XHTML, such as MathML [...]
PAS 78 covers the general principles of building an accessible website, along with a discussion of how disabled people use computers and websites. The heart of the document covers the Web technologies (HTML, CSS, JavaScript), as well as rich media format (such as PDF, Flash, audio and video). The section on testing covers technical testing [...]
Fahrner Image Replacement (abbreviated FIR) is a Web design technique that uses Cascading Style Sheets to replace text on a Web page with an image containing that text. It is intended to keep the page accessible to users of screen readers, text-only web browsers, or other browsers where support for images or style sheets is [...]
David Siegel’s 1996 book ”Creating Killer Web Sites” [http://www.killersites.com/killerSites/core.html] was allegedly the first to publish the Spacer GIF technique. According to Siegel, he invented the trick in his living room. The use of spacer GIFs has declined due to the prevalence of Cascading Style Sheets (CSS) for laying out web pages, which achieves the same [...]
The ”blink” value of the CSS ”text-decoration” property allows authors to suggest that text should blink without using proprietary tags, but the ”CSS 2.1 Specification” states that “conforming user agents may simply not blink the text” in order to comply with the ”User Agent Accessibility Guidelines”. Example: .advertisement { text-decoration: blink; } Adapted from the [...]
Amaya is a direct descendant of the ”Grif” WYSIWYG SGML editor created by Vincent Quint and Irène Vatton at INRIA in the early 1980s, and of the HTML editor Symposia, itself based on Grif, both developed and sold by French software company Grif SA. Originally designed as a structured text editor (predating SGML) and later [...]
If a user revisits a Web page after only a short interval, the page data may not need to be re-obtained from the source Web server. Almost all web browsers cache recently obtained data, usually on the local hard drive. HTTP requests sent by a browser will usually only ask for data that has changed [...]
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