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Is it necessary to install the Walker plugin, if all I want to do is add a caret to the dropdown?
It seems like overkill to install the Walker plugin if all I really want to do is add the caret icon next to dropdown links.
Kevin Korte28,111 Points
If you just want to add the dropdown caret it's overkill. Walker functions should be used to change the actual HTML structure that WP spits out.
If you're happy with the default HTML structure WP uses, I'd just add the caret with CSS and be done with it.