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It is possible
that your application will have
some kind of UI that requires some collection of icons, colors, etc.
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Usually this may
be in the form of toolbar button icons, but you may want to do more to
control the look of your application.
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As we saw in the
previous example, you can attach CSS style sheets to XUL documents, and in
these style sheets you can easily set toolbar button icons for example by
using the list-style-image property.
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You can also do
more elaborate things – it is an XML document and thus is completely
stylable using the W3C CSS standard as implemented by Gecko.
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