At the top of an HTML file source, you may see some code that indicates the version of HTML that is going to be used.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
The O'Reilly Net.com has a discussion:
"There are three variants on HTML 4.01, for example:
- HTML 4.01 Strict, which describes the structural portions of HTML 4.01 and does not provide any frame-related markup.
- HTML 4.01 Transitional, which includes the presentational markup such as >B< and >FONT<, but does not include frame-related markup.
- HTML 4.01 Frameset, which is the same as HTML 4.01 Transitional except that it adds a description of frame-related markup."
Fix Your Site With the Right DOCTYPE!
Choosing a DOCTYPE
The global structure of an HTML document
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