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正如问题所言。如果您的 HTTP 标头和文档上的元标记中都有 X-UA-Compatible,并且它们发生冲突,那么 IE 会尊重哪一个?
TL;DR:元标记获胜
我在这里找到了以下(更新的)流程图(链接已损坏)和相关的博客文章,其中解释了 IE9 如何确定文档模式: