DocumentType: systemId 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 systemId property of the DocumentType returns the URL of the associated DTD.

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

Value

A string.

Examples

js
const docType = document.implementation.createDocumentType(
  "svg",
  "",
  "http://www.w3.org/2000/svg",
);

console.log(docType.systemId); // Displays "http://www.w3.org/2000/svg"

Specifications

Specification
DOM Standard
# dom-documenttype-systemid

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
systemId

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support