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This article mainly explains the "html5 how to define document types", the article explains the content is simple and clear, easy to learn and understand, the following please follow the editor's ideas slowly in depth, together to study and learn "html5 how to define document types" bar!

In html5, a doctype declaration is used to define the document type, with the syntax "". DOCTYPE is a document type tag, a standard generic markup language document type declaration that is used in web design to indicate what version of XHTML or HTML you are using.

The operating environment of this tutorial: windows7 system, HTML5 version, Dell G3 computer.

In html5, use the doctype declaration to define the document type.

DOCTYPE is an abbreviation for document type (document type).

DOCTYPE is a document type tag, a standard generic markup language document type declaration that is used in web design to indicate what version of XHTML or HTML you are using.

Document title document content.

The DOCTYPE declaration must be the first line of the HTML document, before the tag.

Description:

In HTML 4.01, the declaration refers to DTD because HTML 4.01 is based on SGML. DTD specifies the rules of the markup language so that browsers can render content correctly.

HTML5 is not based on SGML, so there is no need to reference DTD.

There are three kinds of declarations in HTML 4.01. There is only one type of HTML5:

Note:

The label does not have an end tag.

The declaration is not case-sensitive.

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