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Non-singular views should have a .multiple class for easier styling. This would show on is_home(), is_archive(), or is_search(). Yeah, I know some of you've asked for this for a while. It's coming.
I like .plural to oppose .singular
is_singular() ? 'singular' : 'plural'
I like plural too just because I'm an English geek. :)
Exactly :) That should make it easy to document too.
twentyfourteen use "list-view"
if ( is_archive() || is_search() || is_home() )
$classes = 'list-view';
plural was the choice I made. This is in HC 2.0.