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nbsp;html>Document 11 字体居中
我设置了子元素boxBar1 向做浮动，子元素boxBar2没有浮动，理论上他会给boxBar1让出他自己的那一部分呈现在页面上。
这时候我设置了boxBar2宽度和父亲宽度相等。但是我设置了字体居中，字体竟然没有相对于本身800的宽度居中。而是相对于本身宽度减去boxBar1的宽度然后再居中。这是为什么？
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