Buttons can do an action, display a menu, or both:
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Buttons have showLabel=false so text is not displayed. Should have title attribute displayed on mouse over
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The button CSS as well as the icon CSS can change on toggle
Short button, tall buttons, big buttons, small buttons... These buttons size to their content (just like <button>).
Dojo users can mix in their styles. Here's an example:
(Ticket #403)
clicking the buttons below will change the buttons above