W3cubDocs

/DOM

document.doctype

Returns the Document Type Declaration (DTD) associated with current document. The returned object implements the DocumentType interface. Use DOMImplementation.createDocumentType() to create a DocumentType.

Syntax

doctype = document.doctype;

doctype is a read-only property.

Example

var doctypeObj = document.doctype;

console.log(
  "doctypeObj.name: "           + doctypeObj.name            + "\n" +
  "doctypeObj.internalSubset: " + doctypeObj.internalSubset  + "\n" +
  "doctypeObj.publicId: "       + doctypeObj.publicId        + "\n" +
  "doctypeObj.systemId: "       + doctypeObj.systemId
);

Notes

The property returns null if there is no DTD associated with the current document.

DOM level 2 doesn't support editing the document type declaration.

Specifications

Specification	Status	Comment
Document Object Model (DOM) Level 3 Core Specification The definition of 'Document.doctype' in that specification.	Recommendation	Changed return value for HTML documents with absent `<html>` element. Defines that the document type can be changed.
Document Object Model (DOM) Level 2 Core Specification The definition of 'Document.doctype' in that specification.	Recommendation	Initial definition

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https://developer.mozilla.org/en-US/docs/Web/API/document/doctype