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我有两个 CSS 文件为同一个选择器指定相同的属性。第一个文件有：
.test{ padding: 0.3em; }
第二个文件有：
.test{ padding: 3px; }
Internet Explorer 遵循第二条规则，而 Firefox 遵循第一条规则。这是因为 Firefox 认为ems 具有更高的优先级吗？
em