Note: If there is a document type declaration, the instance can be parsed with or without reference to it.

The general syntax for a document type declaration is:

The Name in the document type declaration does not match the element type of the root element.

Another example is Internet Explorer which will render pages in standards mode only when it starts with a document type declaration.

It typically occurs in a Document Type Declaration.

It is the Document Type Declaration and it appears as the first line of a text file.

Another important component is the HTML document type declaration, which triggers standards mode rendering.

The Document Type Declaration is for HTML5.

Document type declaration for XHTML.

Internet Explorer 6 also uses quirks mode if there is an XML declaration prior to the document type declaration.

A DTD (Document Type Declaration) should be the first line of a Web document.

HTML documents are required to start with a Document Type Declaration (informally, a "doctype").

In the example below, the XML document is declared with because it has an external subset in its document type declaration:

Internet Explorer versions 6 and onward are not affected by the bug if the page contains certain HTML document type declarations.

It comes with a new introductory line that looks like an SGML document type declaration, , which triggers the standards-compliant rendering mode.

Part of that definition is the Document Type Declaration (DTD), which defines the syntax of the language.

HTML 4.0 specifies three DTDs, so authors must include one of the following document type declarations in their documents.

Comments may appear anywhere in a document outside other markup; in addition, they may appear within the document type declaration at places allowed by the grammar.

For proof of this assertion, check out the validator's reports for the following sites: www.microsoft.com www.google.com www.yahoo.com All of these fail to even include the document type declaration!

A document type declaration (for HTML 4.01 strict) containing an FPI:

The prologue shall also contain a document type declaration, also known as a DOCTYPE statement.

It allows the user to associate element, entity, and notation declarations with particular document type names, via multiple document type declarations."

According to the document type declaration, the identifiers of an XHTML+RDFa document should look like the following:

An XML document is valid if it has an associated document type declaration and if the document complies with the constraints expressed in it.

After document type declaration, the remainder of an HTML document is contained by the HTML element.