typefast | Minimalistic distraction-free typing speed test

It's running twice because you are explicitly calling typefast() twice in your document.ready function. Even though your selectors were both missing the # in them, typefast() still gets called on the empty jQuery wrappers. And, since typefast() doesn't actually do anything with the contents of the wrapped set it gets called on, it goes ahead and processes on all input elements. So, the end result is that all input elements get typefast registered into their focus event twice.

If (and this is a big if) you were going to use a plug-in for this, you should just call it once because the plug-in finds all input elements and sets their event handler. Also, plug-ins have a certain pattern that is recommended to be followed to ensure that the $ will, in fact, point to the jQuery object and to ensure that method chaining will work. That would look like this: