外部CSS文件相关的图像路径参考外部图像？
Do external CSS files with relative image paths reference external images?
DTD还可以存在于要剖析之文件所参考的外部文件中。
The DTD can also live in an external document that is referenced by the document being parsed.
DTD还可以存在于要剖析之文件所参考的外部文件中。
The DTD can also live in an external document that is referenced by the document being parsed.
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