The anatomy of a gadget is very simple: the root document node is a "module" containing a "moduleprefs" element, "userpref" elements, and "content". Gadgets provide several interesting features, e.g.

Gadget的内部构造非常简单：文档的根节点“module”包含一个“moduleprefs”元素，若干“userpref”元素和一个“content”元素。

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