jquery/jquery — pull request #797 by mikesherov (2012-05-26 04:50:43+00:00)
Title: fixes #8627, .animate() fails on letterSpacing in IE

size diff:

```
Running "compare_size:files" (compare_size) task
Sizes - compared to master
251944 (+324) dist/jquery.js
92807 (+66) dist/jquery.min.js
33274 (+39) dist/jquery.min.js.gz
```

Interesting to note that some browsers convert normal to a pixel value already and never truly return `normal` from `getComputedStyle`. That's why the units just check for something that's convertable to a number, and therefore useful for animating.

Also, used some of the new auto-parsefloat stuff that @gibson042 added to .css to simplify the logic for transforming the result from css.