compatMode

• Description
• Syntax
• Examples
• Links

The compatMode of Document for JS returns the string "BackCompat" if document’s mode is "quirks"; otherwise "CSS1Compat".

document.compatMode

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

• Web Hypertext Application Technology Working Group (WHATWG)