div内嵌套p,div等元素出现的问题
文章内有些问题，可能不适应今天了。
正在学习前端，小问题是不能忽视的。
1 <!DOCTYPE html> 2 <html> 3 <head> 4 <title> new document </title> 5 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> 6 <style type="text/css"> 7 div {margin:0;padding:0;} 8 9 /*解决方案1？：加个border可以让外部div变大，但是border的1px，用margin=-1px消除不了 border:1px solid #000;margin:-1px; */10 #top,#bottom {background:red;}11 #bottom{background:green;}12 13 p{margin:20px;}14 #div {margin:30px;}15 16 /* 此时margin为0，效果OK */ 17 /* 接下来先去掉p标签的margin:0;让前面的定义生效 18 p{margin:0px;} */ 19 #div {margin:0;}20 21 /*解决方案2：*/22 #top { 23 overflow:hidden; /* 针对FF，Opera有效 */ 24 zoom:1; /* 对IE有效 */ 25 } 26 27 </style>28 </head>29 30 <body>31 32 <div id="top">33 <p>p-tag margin</p>34 </div>35 36 <div id="bottom">37 <div id="div">div margin</div>38 </div>39 40 </body>41 </html> 解决方案1是有问题的，margin:-1px;并不能解决高度增大问题，chrome,FF,Opara测试了下都不行。
解决方案2，可以完美解决（IE我没测试）。
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