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Glossary of Terms
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What is DocType?

What is a DocType? Ever been leery of asking silly questions like - what is a DocType? No worries, this article attempts to answer that question for you so you don't even have to worry about asking it in privacy.

Doctype declarations shouldn't be reserved as loose, standard written source code that doesn't matter. Faulty doctypes render the ability to validate compliant web pages impossible. Take note, the best system design with the greatest style elements regardless of authoring, tools, text, or use of Document Object Model may not produce valid documents or pages and may experience browser problems, even with older and newer versions of Explorer or Netscape, if the declarations in the doctypes aren't up to standards.

Older versions of Explorer and Netscape render a document in quirk mode while newer versions do their rendering in standard mode. In the absence of doctypes, you'll find the browser switching to quirk instead of standard mode.

DocType is short for document type declaration. Its responsibilities as part of the frameset list include acting as an identifier, specifying certain attributes such as the versions of XHTML or HTML you are using. IE6, IE5/ Mac and Mozilla will all experience quirks in rendering web pages with non compliant doctypes. Opera has its own markup issues and javascript exceptions, but for the most part, it is the browser that has the least issues with faulty doctypes.

Using different doctypes basically affects the way pages are rendered by web browsers which ultimately impacts the performance of the web pages.

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