The EntityDeclaration event represents unparsed general entities declared in the document's DTD.
EntityDeclaration 事件表示在文档的 DTD 中声明的非解析的一般实体。
So to summarize, the internal subset of a DTD is checked for internal general entities, which are correctly processed.
总的来说,Firefox 对 DTD 的内部子集进行检查来识别内部一般实体,从而正确地处理它们。
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