importance: 3

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# What is the scrollbar width?

Write the code that returns the width of a standard scrollbar.

For Windows it usually varies between `12px` and `20px`. If the browser doesn't reserve any space for it (the scrollbar is half-translucent over the text, also happens), then it may be `0px`.

P.S. The code should work for any HTML document, do not depend on its content.