Document: doctype property

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

The doctype read-only property of the Document interface is a DocumentType object representing the Document Type Declaration (DTD) associated with the current document.

Value

A DocumentType object.

Examples

js
const doctypeObj = document.doctype;

console.log(`doctypeObj.name: ${doctypeObj.name}`);
console.log(`doctypeObj.internalSubset: ${doctypeObj.internalSubset}`);
console.log(`doctypeObj.publicId: ${doctypeObj.publicId}`);
console.log(`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
DOM
# ref-for-dom-document-doctype①

Browser compatibility