What does ‘::’ (double colon) do in JavaScript?

Question

The documentation of some JavaScript APIs shows the following snippets as an example of how to invoke some function:

Answer 1

In which example did you see that? So far, JavaScript does not have a double colon operator!

The double colon replaced the single-colon selectors for pseudo-elements in CSS3 to make an explicit distinction between pseudo-classes and pseudo-elements. But that is CSS3, not JavaScript! Not At ALL!