Adam Wathan d77bc055ee Support for basic variant generator plugins
Allows you to write a plugin that registers a new variant but only
allows you to modify the selector (like what our built-in generators
do.)

Next steps are to support variants that wrap rules with at-rules
(like @supports for example), variants that can modify properties
(as opposed to just selectors), and to give variant plugin authors
control over how responsive variants interact with their own variants.
2018-06-26 13:44:47 -04:00
..
2018-06-22 09:55:56 -04:00
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