That button normally doesn't have an image associated with it, but if you're going to add one, it looks like 14px would be the max height. Buttons don't have limits on their images though. Use whatever looks "right".
Are there default back, forward, and refresh buttons similar to what iOS has?
Go here, then scroll down to the "Image Template Constants" section near the bottom, and you'll find a list of images that are built-in. They can be used with NSImage's imageNamed: method.
That button normally doesn't have an image associated with it, but if you're going to add one, it looks like 14px would be the max height. Buttons don't have limits on their images though. Use whatever looks "right".
Go here, then scroll down to the "Image Template Constants" section near the bottom, and you'll find a list of images that are built-in. They can be used with NSImage's imageNamed: method.