Document: doctype property
目录
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
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.