<!DOCTYPE>
The <!DOCTYPE> Tag is used as an "Identifier"
that tells the browser what HTML Specification your page conforms to. This
Tag should be the first line of any HTML page. Programs that validate the
syntax of HTML documents can also use this tag to identify the
version of the HTML specification to decide how to perform the validation.
For example, Microsoft FrontPage's <!DOCTYPE> is:
<!DOCTYPE HTML PUBLIC "-//IETF//DTD
HTML//EN">
It's not too important, and it is getting used less and less,
but it is the standard.
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