+s and ~s Are Siblings
<div>
<div class="c"></div>
<div class="x"></div>
<div class="y"></div>
</div>
using .c + div {}
will style "x"
CSS ONLY WORKS DOWNWARDS!
,s Are Multiple Classes
<div>
<div class="c"></div>
<div class="x"></div>
</div>
using .c, .x {}
will style both "c"
and "x"
the same way.
No Space Means More Conditions
<div>
<div class="c x"></div>
<div class="c"></div>
<div class="x"></div>
</div>
using .c.x {}
will style "c x"