4.8. Summary
Mozilla's XUL language is full of widgets, and the <button> tag is the simplest of them. Because buttons are such a common concept, there are a number of variations to consider. <button> and <toolbarbutton> cover most requirements. Although the capabilities of a button make it unique, users are very sensitive to appearances as well. A button must look and act like a button.
The business of appearances is linked directly to themes. Mozilla uses CSS2 stylesheet technology as the basis for its themes, plus some simple URL modification trickery. Themes apply to every window of a XUL application, and each window adopts one or more skins from a given theme. A skin is just a document-set of styles that follow the guidelines of a theme's ...
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