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HTML <!doctype> Tag


HTML <!doctype> tag refer to the document type declaration use to specifying which version of HTML the document is using.

HTML <!doctype> declaration is not an HTML tag. It's a information about which version of the markup language the page is written.

Doctypes Available in the W3C Recommendations:

HTML 4.01 Strict

All HTML tag and attributes are allow to supported document type.It's not allow to frame set and presentational.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" 
"http://www.w3.org/TR/html4/strict.dtd">

HTML 4.01 Frameset

HTML 4.01 Transitional allows to use frameset.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN" 
"http://www.w3.org/TR/html4/frameset.dtd">

HTML 4.01 Transitional

HTML 4.01 Transitional allow to use presentational.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN" 
"http://www.w3.org/TR/html4/frameset.dtd">