Projects/Usability/HIG/Buttons

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A button initiates an action when the user clicks it.

Toggle buttons are a special case where a button has a state.

Guidelines

Use title style capitalization for the label.
Buttons are not dynamic; their content or labels should not change depending on the context.
Don't initiate an action on right-click or double-click cause the user won't expect it.
Prefer using icons on buttons only for ok, apply, cancel like actions. Passive actions like e.g. those in the "System Settings => Application Appearance => Fonts" don't have icons. Don't overboard with icons.