body在默认情况下是具有margin外边距的:
这里只是陈述一个事实，那就是body具有外边距在默认情况下。
代码实例如下:
<!DOCTYPE html><html><head><meta charset="utf-8"><meta name="author" content="http://www.softwhy.com/" /><title>蚂蚁部落</title><style type="text/css"> body{ background:blue;}#box{ width:200px; height:100px; background:red; text-align:center; line-height:100px;}</style></head><body><div id="box">蚂蚁部落</div></body></html>从上面的代码可以看出，box元素与外围有一定的空隙，再来看一段代码实例:
<!DOCTYPE html><html><head><meta charset="utf-8"><meta name="author" content="http://www.softwhy.com/" /><title>蚂蚁部落</title><style type="text/css"> body{ background:blue; margin:0px;}#box{ width:200px; height:100px; background:red; text-align:center; line-height:100px;}</style></head><body><div id="box">蚂蚁部落</div></body></html>上面的代码可以看出，空隙消失，说明body是具有外边距的。
所以在正式些页面之前，通常先重置一下样式属性，具体可以参阅css预重置样式代码一章节。
原文地址是:http://www.softwhy.com/forum.php?mod=viewthread&tid=18131
更多内容可以参阅:http://www.softwhy.com/divcss/
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