doctype

• Description
• Syntax
• Examples
• Links

The doctype of Document for JS returns the doctype or null if there is none.

document.doctype

• adoptNode
• characterSet
• compatMode
• contentType
• createCDATASection
• createComment
• createDocumentFragment
• createElement
• createElementNS
• createProcessingInstruction
• createTextNode
• Document
• documentElement
• documentURI
• exitPictureInPicture
• getElementsByClassName
• getElementsByTagName
• getElementsByTagNameNS
• implementation
• importNode
• pictureInPictureEnabled
• URL
• write
• writeln

• Web Hypertext Application Technology Working Group (WHATWG)