Companion aliases

[kizu]

One minor improvement can be the following: for many properties there can be “fallbacks” or extras, that need to be expanded along with some properties:

• dib to

  display: -moz-inline-stack;
  display: inline-block;
  

• clip to

  clip: (auto auto auto auto);
  clip: (auto,auto,auto,auto);
  

• etc.

It's not something crucial, but it would nice to have a way to make such things in feature.