doctype

• Description
• Syntax
• Examples
• Links

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

document.doctype

• adoptNode
• body
• characterSet
• close
• compatMode
• contentType
• cookie
• createCDATASection
• createComment
• createDocumentFragment
• createElement
• createElementNS
• createProcessingInstruction
• createTextNode
• currentScript
• defaultView
• designMode
• dir
• Document
• documentElement
• documentURI
• domain
• embeds
• exitPictureInPicture
• forms
• getElementsByClassName
• getElementsByName
• getElementsByTagName
• getElementsByTagNameNS
• hasFocus
• head
• hidden
• images
• implementation
• importNode
• lastModified
• links
• location
• onreadystatechange
• onvisibilitychange
• open
• parseHTMLUnsafe
• pictureInPictureEnabled
• plugins
• readyState
• referrer
• scripts
• title
• URL
• visibilityState
• write
• writeln

• Web Hypertext Application Technology Working Group (WHATWG)