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Note:
Specifies the document type definition (DTD) and must appear before the HTML tag.
Syntax:
<!DOCTYPE TopElement Availability "-//Organization//Type LanguageVersion Definition//LanguageCountry">
Correct syntax requires that the attribute values be specified without attribute names,
as in the following examples:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN">
<!DOCTYPE> Specific Attributes Ordered by Syntax
Attribute Name Note
-----------------+-----------------+--------------------------------------------------------
Top Element Specifies the markup language used in the document.
The default value is HTML.
-----------------+-----------------+--------------------------------------------------------
Availability Specifies whether the DTD is publicly accessible or
is available as a system resource.
Values: PUBLIC Indicates the DTD is publicly accessible; the default value
SYSTEM Indicates a local DTD file or a URL that points to a DTD file
-----------------+-----------------+--------------------------------------------------------
Organization Specifies the organization responsible for
the creation and maintenance of the DTD being used.
Values: W3C or IETF.
-----------------+-----------------+--------------------------------------------------------
Type Specifies the type of object used in the page.
The default value is DTD.
-----------------+-----------------+--------------------------------------------------------
Language Version Specifies the version of the markup language used for the document.
The default value is HTML 4.0.
-----------------+-----------------+--------------------------------------------------------
Definition Define the document type.
If no value is specified, the document can make use of any of the types.
Values: frameset For frameset documents
strict Supports mainly style sheets
transitional Does not contain frameset elements
-----------------+-----------------+--------------------------------------------------------
Language Country Specifies the language used in the document (Spanish, English, and so on).
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