html5的各浏览器兼容问题怎么解决啊
<!DOCTYPE html>
<html manifest="存储缓存信息.appcache">
<head>
<meta name="keywords" content="百度，百度一下，百度一下 你就知道"/>
<meta name="description" content="通过搜索关键字，得到您想知道的答案"/>
<meta name="author" content="secret"/>
<meta name="application-name" content="百度一下，你就知道"/>
<meta name="generator" content="txt"/>
<meta http-equiv="content/type" content="text/html,charset=UTF-8"/>
<meta http-equiv="refresh" content="500000,url=www.baidu.com"/>
<meta http-equiv="expires" content="09 Dec 2016"/>
<title>百度一下，你就知道</title>
<base href="H:\个人\html\baidu\">
<link rel="icon" href="baidu\smallsign.png" target="_self">
<link rel="stylesheet" href="baidu.css" type="text/css">
<script>
document.creatElement("header");
document.creatElement("nav");
</script>
</head>
<body>
<header>
<nav>
<span><a href="https://www.nuomi.com/">糯米</a></span>
<span><a href="http://news.baidu.com/">新闻</a></span>
<span><a href="https://www.hao123.com/">hao123</a></span>
<span><a href="http://map.baidu.com/">地图</a></span>
<span><a href="http://v.baidu.com/">视频</a></span>
<span><a href="http://tieba.baidu.com/">贴吧</a></span>
<span><a href="#">登录</a></span>
<div id="set">
<span><a href="">设置</a></span>
<div id="setdrow">
<div id="trangle"></div>
<div id="square">
<a href="#">搜索设置</a>
<a href="#">高级搜索</a>
<a href="#">关闭预测</a>
<a href="#">搜索历史</a>
</div>
</div>
</div>
<div id="buttondrow">
<button>更多产品</button>
<div id="menudrow">
<span id="more">更多产品</span>
<hr color="#e8e8e8" size="1px">
<img src="1.png" alt="music">
<a href="">音乐</a>
<hr color="#e8e8e8" size="1px">
<img src="2.png" alt="picture">
<a href="">图片</a>
<hr color="#e8e8e8" size="1px">
<img src="3.png" alt="knowlege">
<a href="">知道</a>
<hr color="#e8e8e8" size="1px">
<img src="4.png" alt="words">
<a href="">文库</a>
<hr color="#e8e8e8" size="1px">
<img src="5.png" alt="loundlist">
<a href="">风云榜</a>
<hr color="#e8e8e8" size="1px">
<a href="">全部产品>></a>
</div>
</div>
</nav>
</header>
<div id="picture">
<img src="sign.png" alt="百度一下，你就知道" align="center">
</div>
</body>
</html>
为什么header nav我都设置dispaly：block;可是底下id=picture还是和他俩在一行，为什么呢，即使我在header外面还加一层div但还是在一行
weibo_快乐is魏帆_02回答
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筱汐
定宽 浮动呗 -
慕瓜9220888
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