DocumentType: name 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 read-only name property of the DocumentType returns the type of the document.

For synthetic DocumentType, this property reflects the value given in parameter to DOMImplementation.createDocumentType().

For HTML documents, browsers always set it up to html, whatever the actual doctype in the source code is.

A string.

const docType = document.implementation.createDocumentType("html", "", "");

console.log(docType.name); // Displays `html`

Specification
DOM Standard # dom-documenttype-name

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