Feature: CSS Alias named selector sets

[wesleyolis]

Proposal

The ability to define an alias name, which represents a set of CSS selectors, which can then
easily be used and where the CSS selectors would have had to have been written out in full.
This would reduce the overhead of having to repeat oneself a lot for similar selector sets combinations
and slight specializations.

Where a % sign is used or some other symbol or no symbol to represent a selector set, it doesn't matter,its the behaviour and functionality that we would be looking for.

i.e, Example:

%cssAliasNameTest #someid, #someotherId, div > span.testclass 

%cssAliasNameTest div.neasteditem, div.someotherrandomdiv {
background-colour:#blue;
}

[keithamus]

I’m curious what use cases you see for this that can’t be achieved with nesting?

[Loirooriol]

Already in the spec: https://drafts.csswg.org/css-extensions-1/#custom-selectors