max-height和height属性同时设置时的情况:
关于标题中的两个属性的基本用法这里就不多介绍，具体可以参阅相关阅读。
相关阅读:
（1）.max-height属性可以参阅CSS的max-height属性一章节。
（2）.height属性可以参阅CSS的height属性一章节。
下面介绍这两个属性的关系，其实从字面意思看就很简单，那就是max-height属性是对height属性的限制。
就算是设置height的字面值超过了max-height，也不会生效，代码如下:
<!DOCTYPE html><html><head><meta charset=" utf-8"><meta name="author" content="http://www.softwhy.com/" /><title>蚂蚁部落</title><style>#box{ width:200px; max-height:200px; height:500px; background-color:red;}</style></head><body><div id="box"></div></body></html> 上面代码演示了两者的关系，当然对于max-width和width也是这样的关系。
原文地址是:http://www.softwhy.com/forum.php?mod=viewthread&tid=16365
更多内容可以参阅:http://www.softwhy.com/divcss/
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