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JavaScript and DOM binding

I read the DOM standard where it points out :

DOMImplementationRegistry is a global variable that has the following functions: getDOMImplementation (functions) ... etc.

I am trying to understand, but cannot find information about:

  • which provides the implementation of this DOMImplementationRegistry object?
  • How does JavaScript get the desired DOM implementation? Is this implemented in JavaScript (for use in JavaScript)?
  • how can i access this variable ( DOMImplementationRegistry)?

Could you explain this to me or provide a useful link?

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