Yay for Sass! 

Returns after commas, and added spaces after each selector. (it's Sass, let them breath since they're going to get compiled anyway)
This could be done in more elegant way, like
```scss
input[type="button"],
input[type="reset"],
input[type="submit"] {
  &:active {
    foo: bar;
  }
  &:focus {
    foo: bar;
  }
  &:hover {
    foo: bar;
  }
}
```