doyoe/css-handbook — pull request #22 by myst729 (2014-09-20 16:10:05+00:00)
Title: add timing-function `steps()`

Modified
```
/properties/animation/animation-timing-function.htm
/properties/transition/transition-timing-function.htm
```

[1] http://dev.w3.org/csswg/css-animations/#typedef-single-timing-function
[2] http://dev.w3.org/csswg/css-transitions-1/#single-transition-timing-function