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Jun 24, 2016 am 11:31 AM

.login_wrapper这个div用百分比可以显示

<html><head><title></title><style>body{width:100%;height:100%;}.login_wrapper{ width:50%;height:100%;background-color:red;}</style></head><body><div class="login_wrapper"></div></body></html>

而加上DOCTYPE 声明如下，就不能显示了，为什么？

<html><head><title></title><style>body{width:100%;height:100%;}.login_wrapper{ width:50%;height:100%;background-color:red;}</style></head><body><div class="login_wrapper"></div></body></html>

回复讨论(解决方案)

<!doctype html><html><head><title>this is open lab</title><style>body{width:100%;height:100%;}.login_wrapper{ width:50%;height:100%;background-color:red;}</style></head><body><div class="login_wrapper"> </div></body></html>

<!doctype html><html><head><title>this is open lab</title><style>body{width:100%;height:100%;}.login_wrapper{ width:50%;height:100%;background-color:red;}</style></head><body><div class="login_wrapper"> </div></body></html>

我是想知道为什么加了声明，就不能像不加声明那样显示

浏览器的工作模式不同，对一些错误的处理也不同，最好的就是一直用标准的写法，不要丢三拉四

我想实现用百分比去布局，百分比是基于父标签的，我在body标签中定义width和height都为100%，在div中设置width和height都为50%，给background为red，在有申明情况下就不显示，没有声明情况下在FF42.0和IE8下都能显示，这是为什么？在申明的情况下我该怎么去用百分比布局？

照你的说法：加了doctype就无法实现百分比布局了？怎么可能！

贴上你的代码吧

我就是想知道为什么会出现上面我说的那情况，至于布局肯定能布局，不管怎么样，只有你来

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