Editing Aqua (user interface) (section)

==== Push buttons ====
Standard push buttons with rounded corners are available in two varieties: white and blue. A blue button is the default action, and in OS releases prior to Yosemite, would appear to pulse to prompt the user to carry out that action. The action of a blue button can usually also be invoked with the [[return key]]. White buttons are usually associated with all other actions.

Also available are rounded bevel buttons, designed to hold an icon; standard square buttons; glass square buttons and round buttons. In addition, circular, purple [[online help]] buttons are available which display help relative to the current task when clicked. [[Disclosure widget|Disclosure triangles]], although technically buttons, allow views of controls to be shown and hidden to preserve space.