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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/DocumentType/systemId below:

DocumentType: systemId property - Web APIs

DocumentType: systemId property

Baseline Widely available

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

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