!doctype
Description
The !doctype element for HTML declares the type of document.
It is case-insensitive and placed at the start of the document.
Syntax
<!doctype top-element availability "registration//organization//type label definition//language" "uniform-resource-locator">
| Name | Default | Description |
|---|---|---|
| top element | html | top-level element |
| availability | PUBLIC | formal public identifier (FPI) is a publicly accessible object or a system resource PUBLIC specifies a publicly accessible object SYSTEM specifies a system resource, such as a local file or URL |
| registration | + | registered by the International Organization for Standardization (ISO) + specifies registered - specifies not registered |
| organization | OwnerID, a unique label indicating the name of the organization responsible for creation and maintenance of the DTD | |
| type | DTD | public text class, the type of object being referenced |
| label | HTML | public text description, a unique descriptive name for the public text being referenced |
| definition | document type definition (DTD) Strict specifies non-depreciated and non-frame elements and attributes Transitional specifies depreciated and non-frame elements and attributes Frameset specifies depreciated and frame elements and attributes | |
| language | EN | public text language, the natural language encoding system used in the creation of the referenced object |
| uniform resource locator | location of the referenced object |
HTML 4
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0//EN"> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0//EN" "http://www.w3.org/TR/REC-html40/strict.dtd"> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Frameset//EN" "http://www.w3.org/TR/REC-html40/frameset.dtd"> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
HTML 4.01
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN" "http://www.w3.org/TR/html4/frameset.dtd"> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
HTML5
<!doctype html>
XHTML 1
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd"> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
XHTML 1.1
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
XHTML Basic 1.1
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML Basic 1.1//EN" "http://www.w3.org/TR/xhtml-basic/xhtml-basic11.dtd">
