Are scroll bars always the same width in different browsers?

Question

I need to make a CSS adjustment to compensate for a scroll bar. So I was wondering- are scroll bars always the same width in different browsers and operating systems?

I have two tables, one above the other, with matching columns widths (set to percentages). One table needs a scroll bar, so I want to add another column in the table above it to compensate for it, so the columns line up.

Answer 1

Scrollbars aren't even counted the same in different browsers, some of them put them inside the frame, while others put them outside (thus making alignment a real pain).

Try to think of a way of presenting the data where it won't matter.