Obsolete
This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.
Can request a particular implementation based on needed features and versions (which can then be used to create a document, etc.). Called during DOMImplementationRegistry.getDOMImplementation() and DOMImplementationRegistry.getDOMImplementationList().
DOMImplementationSource.getDOMImplementation()DOMImplementation.DOMImplementationSource.getDOMImplementationList()DOMImplementationList
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https://developer.mozilla.org/en-US/docs/Web/API/DOMImplementationSource