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Document Type Definition

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Your Text: Insert Slimies » Insert UBB Code » Close Last Tag \| All Tags UBB Help	If a browser sees a site without a DTD, it displays the site using rules from the old days. If a browser sees a site with a DTD, it displays the site using modern rules. Different DTDs have different rules. If you want to use modern web authoring techniques (such as CSS), it's best to use a DTD also. However, if you don't have one, the browser will do its best to display it anyway. In general, old web pages that aren't made according to modern standards are considered "invalid" -- that is, they don't follow all the rules. They only work because browsers try hard to understand them. A "strict" parser, one that requires you to follow all the rules, will say that the old pages are written incorrectly. Microsoft and Netscape didn't write the modern standards. They had a conflict, we call it the Browser Wars, where they each made their own version of HTML, with special things that only worked on one browser or the other. To help end the Browser Wars, the World Wide Web Consortium (W3C, or just W3) created what we call "web standards" which would work on all browsers. Microsoft and Netscape are members of the W3, but they're not the entire thing. Web standards aren't perfect, and not all browsers support them in the same way, but things have improved greatly since 1997, or even 1999. Loading...
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