不过，处理指令与HTML文档的级联样式表(CSS)类似。
However, processing instructions are similar to cascading style sheets (CSS) for HTML documents.
扩展名为. css的文件是级联样式表，扩展名为. xml的文件是示例xml文档，可以使用前缀相同的css来显示。
Files with the.css extension are Cascading Stylesheets, and files with the.xml extension are sample XML documents that you can display using the CSS of the same prefix.
实际上，HTML 文档装入级联样式表与此阶段无关。
The fact that the HTML document loads a cascading style sheet is irrelevant at this stage.
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