Editing Scroll wheel (section)

===Mouse button three===
Most scroll wheels work as mouse button three when pressed straight down.
The button is often heavier than other buttons.

PC mice before scroll wheels traditionally followed two competing standards: Logitech's and Microsoft's. Logitech favoured three-button mice, and Microsoft favoured two. First with [[Microsoft]]'s first scroll wheel-equipped [[Microsoft IntelliMouse|IntelliMouse]], did they make the transition of three-button mice, but putting it under the wheel.

This non-obvious functionality, together with traditionally limited adoption by Windows and software applications, has lead to a general lack of awareness of this additional button. The number of websites that fail to accept middle-click to open links in a new tab suggests how many web designers alone remain oblivious to this facility.