属性不会继承它们的元素的名称空间，也不会假设一个默认名称空间。
Attributes never inherit a namespace from their elements and never assume a default namespace.
“扩展”允许一个扩展元素继承基本元素的特性。
"Extends" allows an extending element to inherit characteristics of the base element.
因此，样式表中自身没有定义标准属性的任何元素，都会继承定义这些属性的、距其最近的祖先元素的标准属性。
Thus, for any given element on a stylesheet that does not define the standard attribute on itself, it inherits the standard attributes from its closest ancestor element that defines them.
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