How to add doctype in html page using JavaScript or jQuery

Question

I want to add a doctype for my particular page. How can I add it using JavaScript or jQuery?

I want to add <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml2/DTD/xhtml1-strict.dtd"> using JavaScript.

Dr.Molle · Accepted Answer

You cannot add a DOCTYPE to the current document(or modify it).

From the MDN-docs: doctype is a read-only property.

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