What is Document Type or DOCTYPE Declaration and its versions

Document Type Statements and (X)HTML Versions

A Document Type Declaration, or DOCTYPE, is an instruction that associates a particular SGML or XML document (for example, a webpage) with a Document Type Definition (DTD) (for example, the formal definition of a particular version of HTML). In the serialized form of the document, it manifests as a short string of markup that conforms to a particular syntax. (X)HTML documents should begin with a declaration. This statement identifies the type of mark-up that is supposedly used in a document. For example,
indicates that we are using the transitional variation of HTML 4.01 that starts with a root element html. In other words, an tag will serve as the ultimate parent of all the content and elements within this document.
A declaration might get a bit more specific and specify the URI (Uniform Resource Identifier) of the DTD being used as shown here:
"http://www.w3.org/TR/html4/loose.dtd">

In the case of an XHTML document, the situation really isnít much different:
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
However, do note that the root html element here is lowercase, which hints at the case sensitivity found in XHTML.






























































































HTML or XHTML Version

!DOCTYPE Declaration

HTML5

HTML 4.01 Strict



"http://www.w3.org/TR/html4/strict.dtd">

HTML 4.01 Frameset



"http://www.w3.org/TR/html4/frameset.dtd">

HTML 4.01 Transitional



"http://www.w3.org/TR/html4/loose.dtd">

HTML 4.0 Strict



"http://www.w3.org/TR/html4/strict.dtd">

HTML 4.0 Frameset



"http://www.w3.org/TR/html4/frameset.dtd">

HTML 4.0 Transitional



"http://www.w3.org/TR/html4/loose.dtd">

HTML 3.2

HTML 2.0

XHTML Basic 1.1



"http://www.w3.org/TR/xhtml-basic/xhtml-basic11.dtd">

XHTML Basic 1.0



"http://www.w3.org/TR/xhtml-basic/xhtml-basic10.dtd">

XHTML 2.0



"http://www.w3.org/MarkUp/DTD/xhtml2.dtd">

XHTML 1.1



"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

XHTML 1.0 Frameset



"http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd">

XHTML 1.0 Strict



"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

XHTML 1.0 Transitional



"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">



While there are many different versions of (X)HTML, the good news is that the rough document structure defined for each is pretty similar; of course, the bad news is that little details will be different from version to version, so you need to be precise with your syntax.


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