Document type  - <!DOCTYPE>

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Description
Declares the type and content of the document which allows the browser to correctly interpret the HTML. Most browsers allow for flexibility but, strictly, all documents should start with this element.
No Attributes
Example
<!doctype   html   public    "-//w3c//dtd    html    4.0    //en">
Will be displayed as :

Compatability
HTMLNETSCAPEINTERNET EXPLORER
4.1N2N3N4N6IE3IE4IE5IE6
YES YES YES YES YES YES YES YES YES

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