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	<title>Jennal's Blog &#187; CSS</title>
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		<title>IE7真脆弱啊</title>
		<link>http://jennal.cn/2010/04/28/ie7%e7%9c%9f%e8%84%86%e5%bc%b1%e5%95%8a/</link>
		<comments>http://jennal.cn/2010/04/28/ie7%e7%9c%9f%e8%84%86%e5%bc%b1%e5%95%8a/#comments</comments>
		<pubDate>Wed, 28 Apr 2010 09:16:22 +0000</pubDate>
		<dc:creator>Jennal</dc:creator>
				<category><![CDATA[CSS]]></category>
		<category><![CDATA[Web前台相关]]></category>
		<category><![CDATA[ie7]]></category>

		<guid isPermaLink="false">http://jennal.cn/?p=434</guid>
		<description><![CDATA[一条CSS规则就能让IE7整个崩溃。真是太脆弱了。。。

:first-letter

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			<content:encoded><![CDATA[<p>一条CSS规则就能让IE7整个崩溃。真是太脆弱了。。。</p>

<div class="wp_syntax"><div class="code"><pre class="css" style="font-family:monospace;"><span style="color: #3333ff;">:first-</span>letter</pre></div></div>

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		<slash:comments>4</slash:comments>
		</item>
		<item>
		<title>Input submit button doesn&#8217;t display background image in IE</title>
		<link>http://jennal.cn/2009/12/16/input-submit-button-doesnt-display-background-image-in-ie/</link>
		<comments>http://jennal.cn/2009/12/16/input-submit-button-doesnt-display-background-image-in-ie/#comments</comments>
		<pubDate>Wed, 16 Dec 2009 03:44:21 +0000</pubDate>
		<dc:creator>Jennal</dc:creator>
				<category><![CDATA[CSS]]></category>
		<category><![CDATA[Web前台相关]]></category>
		<category><![CDATA[xhtml]]></category>
		<category><![CDATA[ie]]></category>

		<guid isPermaLink="false">http://jennal.cn/2009/12/16/input-submit-button-doesnt-display-background-image-in-ie/</guid>
		<description><![CDATA[使用css的background-image让IE的input submit按钮显示背景图片。
IE的input要显示背景图片需要有border，如果把border设置为none，那就不能显示背景图片了。
所以我们只好这么做：

border: 0px solid #fff;


完整的代码：
  CSS:

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.btn_test
&#123;
	height: 45px;
	background-image: url&#40;gradVert.jpg&#41;;
	background-repeat: repeat-x;
	border-style: 0px solid #fff;
	display: block;
	cursor: pointer;
&#125;


HTML：

&#60;input type=&#34;submit&#34; name=&#34;someName&#34; value=&#34;Save&#34; id=&#34;someID&#34; class=&#34;btn_test&#34; /&#62;

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			<content:encoded><![CDATA[<p>使用css的background-image让IE的input submit按钮显示背景图片。</p>
<p>IE的input要显示背景图片需要有border，如果把border设置为none，那就不能显示背景图片了。</p>
<p>所以我们只好这么做：</p>

<div class="wp_syntax"><div class="code"><pre class="css" style="font-family:monospace;"><span style="color: #000000; font-weight: bold;">border</span><span style="color: #00AA00;">:</span> <span style="color: #933;">0px</span> <span style="color: #993333;">solid</span> <span style="color: #cc00cc;">#fff</span><span style="color: #00AA00;">;</span></pre></div></div>

</p>
<p>完整的代码：<br />
  <br />CSS:</p>

<div class="wp_syntax"><table><tr><td class="line_numbers"><pre>1
2
3
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9
</pre></td><td class="code"><pre class="css" style="font-family:monospace;"><span style="color: #6666ff;">.btn_test</span>
<span style="color: #00AA00;">&#123;</span>
	<span style="color: #000000; font-weight: bold;">height</span><span style="color: #00AA00;">:</span> <span style="color: #933;">45px</span><span style="color: #00AA00;">;</span>
	<span style="color: #000000; font-weight: bold;">background-image</span><span style="color: #00AA00;">:</span> <span style="color: #993333;">url</span><span style="color: #00AA00;">&#40;</span><span style="color: #ff0000; font-style: italic;">gradVert.jpg</span><span style="color: #00AA00;">&#41;</span><span style="color: #00AA00;">;</span>
	<span style="color: #000000; font-weight: bold;">background-repeat</span><span style="color: #00AA00;">:</span> <span style="color: #993333;">repeat-x</span><span style="color: #00AA00;">;</span>
	<span style="color: #000000; font-weight: bold;">border-style</span><span style="color: #00AA00;">:</span> <span style="color: #933;">0px</span> <span style="color: #993333;">solid</span> <span style="color: #cc00cc;">#fff</span><span style="color: #00AA00;">;</span>
	<span style="color: #000000; font-weight: bold;">display</span><span style="color: #00AA00;">:</span> <span style="color: #993333;">block</span><span style="color: #00AA00;">;</span>
	<span style="color: #000000; font-weight: bold;">cursor</span><span style="color: #00AA00;">:</span> <span style="color: #993333;">pointer</span><span style="color: #00AA00;">;</span>
<span style="color: #00AA00;">&#125;</span></pre></td></tr></table></div>

</p>
<p>HTML：</p>

<div class="wp_syntax"><div class="code"><pre class="html" style="font-family:monospace;">&lt;input type=&quot;submit&quot; name=&quot;someName&quot; value=&quot;Save&quot; id=&quot;someID&quot; class=&quot;btn_test&quot; /&gt;</pre></div></div>
</p>
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		<slash:comments>4</slash:comments>
		</item>
		<item>
		<title>hr高度、颜色设置的通用方法</title>
		<link>http://jennal.cn/2009/10/15/hr%e9%ab%98%e5%ba%a6%e3%80%81%e9%a2%9c%e8%89%b2%e8%ae%be%e7%bd%ae%e7%9a%84%e9%80%9a%e7%94%a8%e6%96%b9%e6%b3%95/</link>
		<comments>http://jennal.cn/2009/10/15/hr%e9%ab%98%e5%ba%a6%e3%80%81%e9%a2%9c%e8%89%b2%e8%ae%be%e7%bd%ae%e7%9a%84%e9%80%9a%e7%94%a8%e6%96%b9%e6%b3%95/#comments</comments>
		<pubDate>Thu, 15 Oct 2009 01:55:02 +0000</pubDate>
		<dc:creator>Jennal</dc:creator>
				<category><![CDATA[CSS]]></category>
		<category><![CDATA[Web前台相关]]></category>

		<guid isPermaLink="false">http://jennal.cn/2009/10/15/hr%e9%ab%98%e5%ba%a6%e3%80%81%e9%a2%9c%e8%89%b2%e8%ae%be%e7%bd%ae%e7%9a%84%e9%80%9a%e7%94%a8%e6%96%b9%e6%b3%95/</guid>
		<description><![CDATA[发现最近记性越来越差了，遇到什么tips还是记录下来比较好。
Words fly away, writings remain.
OK，废话不多少，下面介绍一下hr高度、颜色设置的通用方法。
原来一直以为用height和color的组合就可以设置，结果发现只有在IE下可以。
经过反复试验，发现hr其实是个框。所以，我们把它当做一个框来处理就可以了。
可是又经过反复试验以后，发现设置background-color的方法在IE下无效，所以只能选择设置border，这是在FF、IE、Chrome下通用的方法。
以下给出代码：

hr&#123;
	border:none;
	border-top:1px solid red;
	height:0;
&#125;

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</table>]]></description>
			<content:encoded><![CDATA[<p>发现最近记性越来越差了，遇到什么tips还是记录下来比较好。</p>
<p>Words fly away, writings remain.</p>
<p>OK，废话不多少，下面介绍一下hr高度、颜色设置的通用方法。<br />
原来一直以为用height和color的组合就可以设置，结果发现只有在IE下可以。<br />
经过反复试验，发现hr其实是个框。所以，我们把它当做一个框来处理就可以了。<br />
可是又经过反复试验以后，发现设置background-color的方法在IE下无效，所以只能选择设置border，这是在FF、IE、Chrome下通用的方法。</p>
<p>以下给出代码：</p>

<div class="wp_syntax"><div class="code"><pre class="css" style="font-family:monospace;">hr<span style="color: #00AA00;">&#123;</span>
	<span style="color: #000000; font-weight: bold;">border</span><span style="color: #00AA00;">:</span><span style="color: #993333;">none</span><span style="color: #00AA00;">;</span>
	<span style="color: #000000; font-weight: bold;">border-top</span><span style="color: #00AA00;">:</span><span style="color: #933;">1px</span> <span style="color: #993333;">solid</span> <span style="color: #993333;">red</span><span style="color: #00AA00;">;</span>
	<span style="color: #000000; font-weight: bold;">height</span><span style="color: #00AA00;">:</span><span style="color: #cc66cc;">0</span><span style="color: #00AA00;">;</span>
<span style="color: #00AA00;">&#125;</span></pre></div></div>

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		<item>
		<title>如何快速的呈现我们的网页</title>
		<link>http://jennal.cn/2008/11/25/%e5%a6%82%e4%bd%95%e5%bf%ab%e9%80%9f%e7%9a%84%e5%91%88%e7%8e%b0%e6%88%91%e4%bb%ac%e7%9a%84%e7%bd%91%e9%a1%b5/</link>
		<comments>http://jennal.cn/2008/11/25/%e5%a6%82%e4%bd%95%e5%bf%ab%e9%80%9f%e7%9a%84%e5%91%88%e7%8e%b0%e6%88%91%e4%bb%ac%e7%9a%84%e7%bd%91%e9%a1%b5/#comments</comments>
		<pubDate>Tue, 25 Nov 2008 05:29:08 +0000</pubDate>
		<dc:creator>Jennal</dc:creator>
				<category><![CDATA[CSS]]></category>
		<category><![CDATA[Javascript]]></category>
		<category><![CDATA[Web前台相关]]></category>
		<category><![CDATA[呈现]]></category>
		<category><![CDATA[快速]]></category>

		<guid isPermaLink="false">http://jennal.cn/?p=95</guid>
		<description><![CDATA[一、我们需达解决的麻烦

减少HTTP请求数. 减少HTTP请求数有什么好处

降低服务器跟客户端的建立和消除HTTP请求和响应Header的开销
减少服务器为HTTP连接的进程和线程的开销,如果可能,还会包括GZIP压缩的CPU开销.


减小被请求文件大小, 减少请求数据占用的网络带宽.
让用户更快的看到想要的结果.
提高客户端渲染速度.
让浏览器同时能请求更多的数据.
提高服务器相应速度.
通过版本化控制客户端Cache.

二、如何解决我们的麻烦
A.如何减少HTTP请求数

合并JS文件跟CSS文件。
合并框架图片以及相对变动较少的图片成一张，通过CSS背景切割来完成渲染，比如：加速图片显示。
合理使用本地Cache来缓存JS/CSS/IMAGE。
合理使用UserData缓存JS文件,对于FF用户可以单独请求服务器,这样能解决80%用户的问题.代码可以蓉儿(meizz)的js framework1（标注1）。
把JS跟CSS合并成一个文件

B.减小被请求文件大小,减少请求数据占用的网络带宽

压缩JS体积：删除JS中空白换行,注释,混淆把长变量换成短变量；
压缩CSS体积：删除CSS注释、写法尽量用简写；
使用(X)HTML+CSS方式搭建网站结构,提高CSS重用性,来减少(X)HTML文件大小；
使用服务器端GZIP压缩JS/ CSS文件,缩小传输文件大小。附注:Apache1跟Apache2的GZIP的效率跟方式不一样的，根据需要自行选择。
嗷嗷补充说明：压缩、合并JS和CSS都由程序处理。而不是自己手动去缩删，不然不利于后期维护。

C.让用户更快的看到想要的结果
用户对于一个站点的白页的忍受时间根据统计是8-12秒。白页的产生可能由于各种原因引起,我们能做的就是怎么让用户能变的稍微能等待更久。

方案1：多做一个引导页,让用户体会其中的变化
案例:mail.aol.com中的loading引导页
方案2：优先载入页面结构以及结构图片,后一步载入当前页面数据,再后一步载入Iframe,Flash等数据.让用户尽早的看到被打开页面的希望.

D.提高客户端渲染速度
这个问题就比较泛泛了,影响客户端的渲染速度有多方面的,主要目的都是提高程序方面的效率.

对于大索引的结构,尽可能的少用索引访问,能用访问兄弟节点的方式尽可能用访问兄弟节点的方式.
字符串拼接尽可能用数组方式
大规模添加节点数据,请不要使用appendChild方式,尽量使用类似innerHTML的insertAdjacentHTML方式,FF下需修正（标注1）

E.让浏览器同时能请求更多的数据.
浏览器默认只是支持单域名同时有两个HTTP请求,使用多域名将能把请求数提高,在网络条件优良的情况下,能更快的下载数据,呈现结果.
F.提高服务器相应速度
对于需快速响应的文件,把其放入快速响应的服务器,应该是不错的方案,优化方案请系统储备组提供.
G.通过版本化控制客户端Cache
通常js/css这类文件改动比较频繁,但是为了加载速度变快,我们有可能需要设定这类文件的过期时间为几天后,这样我们碰到的问题就是,如何及时更新这些在cache的文件?
通过一个简单的配置,通过修改JS的版本来及时告诉浏览器,这些文件必须重新请求了,不要继续使用浏览器cache中的数据. 方案有好几个：

手动改这些js的文件名
手动改这些js的路径
通过URL Rewrite方式来改重定位js路径
通过一个在高响应服务器上的一个js配置告知页面,这个页面该链接哪些JS文件
大版本不变,小版本不断追加,等一定时间后,统一更新,高效利用cache

标注

meizz的js framework还没出正式版，有兴趣在CSDN的页面翻一下
Firefox修正方式


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function addHTML&#40;oParentNode, sHTML&#41; &#123;
if&#40;window.addEventListener&#41; &#123;// for MOZ
var oRange = oParentNode.ownerDocument.createRange&#40;&#41;;
oRange.setStartBefore&#40;oParentNode&#41;;
var oFrag = oRange.createContextualFragment&#40;sHTML&#41;;
oParentNode.appendChild&#40;oFrag&#41;;
&#125;
else &#123;// for IE5+
oParentNode.insertAdjacentHTML&#40;&#34;BeforeEnd&#34;, sHTML&#41;;
&#125;
&#125;

转载于：http://www.blueidea.com/tech/site/2007/4822.asp
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</table>]]></description>
			<content:encoded><![CDATA[<p><strong>一、我们需达解决的麻烦</strong></p>
<ul>
<li>减少HTTP请求数. 减少HTTP请求数有什么好处
<ul>
<li>降低服务器跟客户端的建立和消除HTTP请求和响应Header的开销</li>
<li>减少服务器为HTTP连接的进程和线程的开销,如果可能,还会包括GZIP压缩的CPU开销.</li>
</ul>
</li>
<li>减小被请求文件大小, 减少请求数据占用的网络带宽.</li>
<li>让用户更快的看到想要的结果.</li>
<li>提高客户端渲染速度.</li>
<li>让浏览器同时能请求更多的数据.</li>
<li>提高服务器相应速度.</li>
<li>通过版本化控制客户端Cache.</li>
</ul>
<p><strong>二、如何解决我们的麻烦</strong></p>
<p><strong>A.如何减少HTTP请求数</strong></p>
<ol>
<li>合并JS文件跟CSS文件。</li>
<li>合并框架图片以及相对变动较少的图片成一张，通过CSS背景切割来完成渲染，比如：<a href="http://blog.rexsong.com/?p=746" target="_blank">加速图片显示</a>。</li>
<li>合理使用本地Cache来缓存JS/CSS/IMAGE。</li>
<li>合理使用UserData缓存JS文件,对于FF用户可以单独请求服务器,这样能解决80%用户的问题.代码可以<a href="http://blog.csdn.net/meizz" target="_blank">蓉儿</a>(meizz)的js framework1（标注1）。</li>
<li><a href="http://www.loaoao.com/blog/entry/33/" target="_blank">把JS跟CSS合并成一个文件</a></li>
</ol>
<p><strong>B.减小被请求文件大小,减少请求数据占用的网络带宽</strong></p>
<ol>
<li>压缩JS体积：删除JS中空白换行,注释,混淆把长变量换成短变量；</li>
<li>压缩CSS体积：删除CSS注释、写法尽量用简写；</li>
<li>使用(X)HTML+CSS方式搭建网站结构,提高CSS重用性,来减少(X)HTML文件大小；</li>
<li>使用服务器端GZIP压缩JS/ CSS文件,缩小传输文件大小。附注:Apache1跟Apache2的GZIP的效率跟方式不一样的，根据需要自行选择。
<p><strong>嗷嗷补充说明</strong>：压缩、合并JS和CSS都由程序处理。而不是自己手动去缩删，不然不利于后期维护。</li>
</ol>
<p><strong>C.让用户更快的看到想要的结果</strong></p>
<p>用户对于一个站点的白页的忍受时间根据统计是8-12秒。白页的产生可能由于各种原因引起,我们能做的就是怎么让用户能变的稍微能等待更久。</p>
<ol>
<li>方案1：多做一个引导页,让用户体会其中的变化<br />
案例:mail.aol.com中的loading引导页</li>
<li>方案2：优先载入页面结构以及结构图片,后一步载入当前页面数据,再后一步载入Iframe,Flash等数据.让用户尽早的看到被打开页面的希望.</li>
</ol>
<p><strong>D.提高客户端渲染速度</strong></p>
<p>这个问题就比较泛泛了,影响客户端的渲染速度有多方面的,主要目的都是提高程序方面的效率.</p>
<ol>
<li>对于大索引的结构,尽可能的少用索引访问,能用访问兄弟节点的方式尽可能用访问兄弟节点的方式.</li>
<li>字符串拼接尽可能用数组方式</li>
<li>大规模添加节点数据,请不要使用appendChild方式,尽量使用类似innerHTML的insertAdjacentHTML方式,FF下需修正（标注1）</li>
</ol>
<p><strong>E.让浏览器同时能请求更多的数据.</strong></p>
<p>浏览器默认只是支持单域名同时有两个HTTP请求,使用多域名将能把请求数提高,在网络条件优良的情况下,能更快的下载数据,呈现结果.</p>
<p><strong>F.提高服务器相应速度</strong></p>
<p>对于需快速响应的文件,把其放入快速响应的服务器,应该是不错的方案,优化方案请系统储备组提供.</p>
<p><strong>G.通过版本化控制客户端Cache</strong></p>
<p>通常js/css这类文件改动比较频繁,但是为了加载速度变快,我们有可能需要设定这类文件的过期时间为几天后,这样我们碰到的问题就是,如何及时更新这些在cache的文件?<br />
通过一个简单的配置,通过修改JS的版本来及时告诉浏览器,这些文件必须重新请求了,不要继续使用浏览器cache中的数据. 方案有好几个：</p>
<ol>
<li>手动改这些js的文件名</li>
<li>手动改这些js的路径</li>
<li>通过URL Rewrite方式来改重定位js路径</li>
<li>通过一个在高响应服务器上的一个js配置告知页面,这个页面该链接哪些JS文件</li>
<li>大版本不变,小版本不断追加,等一定时间后,统一更新,高效利用cache</li>
</ol>
<p><strong>标注</strong></p>
<ol>
<li>meizz的js framework还没出正式版，有兴趣在CSDN的页面翻一下</li>
<li>Firefox修正方式</li>
</ol>

<div class="wp_syntax"><table><tr><td class="line_numbers"><pre>1
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</pre></td><td class="code"><pre class="javascript" style="font-family:monospace;"><span style="color: #003366; font-weight: bold;">function</span> addHTML<span style="color: #009900;">&#40;</span>oParentNode<span style="color: #339933;">,</span> sHTML<span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#123;</span>
<span style="color: #000066; font-weight: bold;">if</span><span style="color: #009900;">&#40;</span>window.<span style="color: #660066;">addEventListener</span><span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#123;</span><span style="color: #006600; font-style: italic;">// for MOZ</span>
<span style="color: #003366; font-weight: bold;">var</span> oRange <span style="color: #339933;">=</span> oParentNode.<span style="color: #660066;">ownerDocument</span>.<span style="color: #660066;">createRange</span><span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
oRange.<span style="color: #660066;">setStartBefore</span><span style="color: #009900;">&#40;</span>oParentNode<span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
<span style="color: #003366; font-weight: bold;">var</span> oFrag <span style="color: #339933;">=</span> oRange.<span style="color: #660066;">createContextualFragment</span><span style="color: #009900;">&#40;</span>sHTML<span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
oParentNode.<span style="color: #660066;">appendChild</span><span style="color: #009900;">&#40;</span>oFrag<span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
<span style="color: #009900;">&#125;</span>
<span style="color: #000066; font-weight: bold;">else</span> <span style="color: #009900;">&#123;</span><span style="color: #006600; font-style: italic;">// for IE5+</span>
oParentNode.<span style="color: #660066;">insertAdjacentHTML</span><span style="color: #009900;">&#40;</span><span style="color: #3366CC;">&quot;BeforeEnd&quot;</span><span style="color: #339933;">,</span> sHTML<span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
<span style="color: #009900;">&#125;</span>
<span style="color: #009900;">&#125;</span></pre></td></tr></table></div>

<p>转载于：http://www.blueidea.com/tech/site/2007/4822.asp</p>
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		<item>
		<title>隐藏IE横向滚动条</title>
		<link>http://jennal.cn/2008/11/05/%e9%9a%90%e8%97%8fie%e6%a8%aa%e5%90%91%e6%bb%9a%e5%8a%a8%e6%9d%a1/</link>
		<comments>http://jennal.cn/2008/11/05/%e9%9a%90%e8%97%8fie%e6%a8%aa%e5%90%91%e6%bb%9a%e5%8a%a8%e6%9d%a1/#comments</comments>
		<pubDate>Wed, 05 Nov 2008 10:49:29 +0000</pubDate>
		<dc:creator>Jennal</dc:creator>
				<category><![CDATA[CSS]]></category>
		<category><![CDATA[Web前台相关]]></category>

		<guid isPermaLink="false">http://jennal.cn/?p=89</guid>
		<description><![CDATA[在以前的HTML标准下，要隐藏横向滚动条，只需要在CSS里加上
Body
{
   overflow-x:hidden;
}
但是在现在的标准下&#8221;http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd&#8221;下面，上面的代码不产生任何效果，因为现在不是以Body作为容器，而是html标签，所以
加入：
HTML
{
   overflow-x:hidden;
}
但是这样做了以后，在IE7下，鼠标滚轮上下滚动不起作用了，IE6下却是正常的。多加上一行代码就解决问题了
HTML
{
  overflow-x:hidden;
  overflow-y:auto;
}  
<table class="wumii-related-items" cellspacing="0" cellpadding="2" border="0" width="100%" style="clear: both;">
    
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                        <font size="-1" color="#333333" style="line-height: 1.65em; font-size: 12px !important;">Input submit button doesn’t display background image in IE</font>
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</table>]]></description>
			<content:encoded><![CDATA[<p>在以前的HTML标准下，要隐藏横向滚动条，只需要在CSS里加上<br />
Body<br />
{<br />
   overflow-x:hidden;<br />
}<br />
但是在现在的标准下&#8221;http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd&#8221;下面，上面的代码不产生任何效果，因为现在不是以Body作为容器，而是html标签，所以<br />
加入：<br />
HTML<br />
{<br />
   overflow-x:hidden;<br />
}<br />
但是这样做了以后，在IE7下，鼠标滚轮上下滚动不起作用了，IE6下却是正常的。多加上一行代码就解决问题了<br />
HTML<br />
{<br />
  overflow-x:hidden;<br />
  overflow-y:auto;<br />
}  </p>
<table class="wumii-related-items" cellspacing="0" cellpadding="2" border="0" width="100%" style="clear: both;">
    
    <tr>
        <td ><b><font size="-1"  style="display: block !important; padding: 20px 0 5px !important;">您可能也喜欢：</font></b></td>
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                        <font size="-1" color="#333333" style="line-height: 1.65em; font-size: 12px !important;">Input submit button doesn’t display background image in IE</font>
                    </a>
                </td>
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</table>]]></content:encoded>
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