CSS兼容常用技巧
请尽量用xhtml格式写代码，而且DOCTYPE影响 CSS 处理，作为W3C标准，一定要加DOCTYPE声明。
1.div的垂直居中问题
vertical-align:middle; 将行距增加到和整个DIV一样高 line-height:200px; 然后插入文字，就垂直居中了。缺点是要控制内容不要换行 http://www.php100.com
2. margin加倍的问题
设置为float的div在ie下设置的margin会加倍。这是一个ie6都存在的bug。解决方案是在这个div里面加上display:inline;
例如：
<#div id=”imfloat”>
相应的css为
#imfloat{
float:left;
margin:5px;
display:inline;}
3.浮动ie产生的双倍距离
#box{ float:left; width:100px; margin:0 0 0 100px; //这种情况之下IE会产生200px的距离 display:inline; //使浮动忽略}
这里细说一下block与inline两个元素：block元素的特点是,总是在新行上开始,高度,宽度,行高,边距都可以控制(块元素);Inline元素的特点是,和其他元素在同一行上,不可控制(内嵌元素);
#box{ display:block; //可以为内嵌元素模拟为块元素 display:inline; //实现同一行排列的效果 diplay:table;
4 IE与CSS宽度和CSS高度的问题div css技巧
IE不认得min-这个定义，但实际上它把正常的width和height当作有min的情况来使。这样问题就大了，如果只用宽度和高度，正常的浏览器里这两个值就不会变，如果只用min-width和min-height的话，IE下面根本等于没有设置宽度和高度。
比如要设置背景图片，这个宽度是比较重要的。要解决这个问题，可以这样：
#box{ width: 80px; height: 35px;}html>body #box{ width: auto; height: auto; min-width: 80px; min-height: 35px;}
5.页面的最小宽度
min-width是个非常方便的CSS命令，它可以指定元素最小也不能小于某个宽度，这样就能保证排版一直正确。但IE不认得这个，而它实际上把 width当做最小宽度来使。为了让这一命令在IE上也能用，可以把一个＜div> 放到＜body> 标签下，然后为div指定一个类,然后CSS这样设计：http://www.php100.com
#container{ min-width: 600px; width:expression_r(document.body.clientWidth ＜ 600? "600px": "auto" );}
第一个min-width是正常的；css制作但第2行的width使用了Javascript，这只有IE才认得，这也会让你的HTML文档不太正规。它实际上通过Javascript的判断来实现最小宽度。
6.DIV浮动IE文本产生3象素的bug
左边对象浮动，右边采用外补丁的左边距来定位，右边对象内的文本会离左边有3px的间距.
#box{ float:left; width:800px;}
#left{ float:left; width:50%;}
#right{ width:50%;}
*html #left{ margin-right:-3px; //这句是关键}
7.IE捉迷藏的问题
当div应用复杂的时候每个栏中又有一些链接，DIV等这个时候容易发生捉迷藏的问题。
有些内容显示不出来，当鼠标选择这个区域是发现内容确实在页面。解决办法：对#layout使用line-height属性或者给#layout使用固定高和宽。页面结构尽量简单。http://www.php100.com
8.float的div闭合;清除浮动;自适应高度
①例如：＜#div id=”floatA” >＜#div id=”floatB” >＜#div id=”NOTfloatC” >这里的NOTfloatC并不希望继续平移，而是希望往下排。(其中floatA、floatB的属性已经设置为float:left;)
这段代码在IE中毫无问题，问题出在FF。原因是NOTfloatC并非float标签，必须将float标签闭合。在 ＜#div class=”floatB”> ＜#div class=”NOTfloatC”>之间加上 ＜#div class=”clear”>这个div一定要注意位置，而且必须与两个具有float属性的div同级，之间不能存在嵌套关系，否则会产生异常。并且将clear这种样式定义为为如下即可： .clear{ clear:both;}
②作为外部 wrapper 的 div 不要定死高度,div css制作为了让高度能自动适应，要在wrapper里面加上overflow:hidden; 当包含float的box的时候，高度自动适应在IE下无效，这时候应该触发IE的layout私有属性(万恶的IE啊！)用zoom:1;可以做到，这样就达到了兼容。
例如某一个wrapper如下定义：
.colwrapper{ overflow:hidden; zoom:1; margin:5px auto;}
③对于排版,我们用得最多的css描述可能就是float:left.有的时候我们需要在n栏的float div后面做一个统一的背景,譬如:
比如我们要将page的背景设置成蓝色,以达到所有三栏的背景颜色是蓝色的目的,但是我们会发现随着left center right的向下拉长,而page居然保存高度不变,问题来了css 制作,原因在于page不是float属性,而我们的page由于要居中,不能设置成 float,所以我们应该这样解决
再嵌入一个float left而宽度是100%的DIV解决之道。
④万能float 闭合(非常重要!)
关于 clear CSS float 的原理可参见 [How To Clear Floats Without Structural Markup],将以下代码加入Global CSS 中,给需要闭合的div加上 class="clearfix" 即可,屡试不爽.
.clearfix:after { content:"."; display:block; height:0; clear:both; visibility:hidden; }
.clearfix { display:inline-block; }
.clearfix {display:block;}
或者这样设置：.hackbox{ display:table; //将对象作为块元素级的表格显示}
9．高度不能自适应
高度不能自适应是当内层对象的高度发生变化时外层高度不能自动进行调节，特别是当内层对象使用margin 或paddign 时。
例：
#box {background-color:#eee; }
#box p {margin-top: 20px;margin-bottom: 20px; text-align:center; }
p对象中的内容＜/p>
Solution: Add two empty div objects above and below the P object. CSS code: .1{height:0px;overflow:hidden;} or add the border attribute to the DIV.
10. Why is there a gap under the image under IE6 under .div css?
There are many techniques to solve this bug. You can change the layout of html, or set img to display: block or set vertical The -align attribute is vertical-align:top
bottom middle text-bottom can be solved.
11. How to align text and text input box
Add vertical-align :middle;
Firefox and IE’s CSS compatible CSS HACK tips
1. Div centering problem
The div is already centered when margin-left and margin-right are set to auto, and IE No, IE needs to set the body to be centered. First define text-algin: center in the parent element; this means that the content within the parent element is centered.
2. CSS link (a tag) border and background
To add a border and background color to a link, you need to set display: block and float: left to ensure no line breaks. Referring to menubar, setting the height of a and menubar is to avoid dislocation of the bottom edge display. If height is not set, a space can be inserted in menubar.
3. The problem that the hover style does not appear after the hyperlink is visited
The hyperlink style that was clicked and visited no longer has hover and active. Many people should have encountered this problem. The solution is to change the order of CSS properties: L-V-H-A
Code:
4. Cursor finger cursor
Cursor: pointer can display cursor finger shape in IE FF at the same time, hand only IE can
5.UL’s padding and margin
The ul tag has padding value by default in FF , and in IE only margin has a value by default, so defining ul{margin:0;padding:0;} first can solve most problems
6. FORM tag
This tag In IE, some margins will be automatically added, while in FF, the margin is 0. Therefore, if you want the display to be consistent, it is best to specify margin and padding in css. In response to the above two problems, my css generally First of all, use such a style ul, form{margin:0;padding:0;} to define it, so you won’t have a headache later.
7. BOX model interpretation inconsistency problem
The BOX model interpretation in FF and IE is inconsistent, resulting in a difference of 2px. Solution: div{margin:30px!important;margin:28px;} Note that the order of these two margins must not be reversed. IE cannot recognize the important attribute. , but other browsers can recognize it. So it is actually interpreted like this under IE:
If div{maring:30px;margin:28px} is repeatedly defined, it will be executed according to the last one, so you cannot just write margin:xx px!important;#box{ width :600px; //for ie6.0- width:500px; //for ff ie6.0}
#box{ width:600px!important //for ff width:600px; //for ff ie6.0 width : 500px; //for ie6.0-}
8. Attribute selector (this is not compatible, it is a bug in hiding css)
p[id]{}div[id] {}
This is hidden for IE6.0 and versions below, and works with FF and OPera. There is still a difference between attribute selectors and sub-selectors, and the scope of sub-selectors has been reduced in form. , the scope of the attribute selector is relatively large, such as p[id], all p tags with ids are of the same style.
9. The most ruthless method - !important
If there is really no way to solve some detailed problems, you can use this technique. FF will automatically parse "!important" first, but IE will ignore it. As follows
.tabd1{
background:url(http: //www.php100.com/res/images/up/tab1.gif) no-repeat 0px 0px !important;
background:url(http://www.php100.com /res/images/up/tab1 .gif) no-repeat 1px 0px; }
It is worth noting that the sentence xxxx !important must be placed above another sentence.
10. IE, FF default value problem
Maybe you have been complaining about why you have to write different CSS specifically for IE and FF, why IE is such a headache, and then while writing css, While cursing that abominable M$ IE. In fact, in terms of CSS standard support, IE is not as abominable as we imagined. The key is that the default values of IE and FF are different. Master this skill, and you will find that you can write code that is compatible with FF. It’s not that difficult with IE’s css. Maybe for simple css, you don’t need the “!important” thing at all.
We all know that when the browser displays a web page, it will decide how to display it based on the css style sheet of the web page, but we may not necessarily describe all the elements in the style sheet in detail. Of course, There is no need to do that, so for those attributes that are not described, the browser will use the built-in default method to display, such as text. If you do not specify a color in CSS, the browser will display it in black or system color. If the background of a div or other element is not specified in CSS, the browser will set it to white or transparent, as will other undefined styles. Therefore, the fundamental reason why many things are displayed differently between FF and IE is that their default displays are different. As for how this default style should be displayed, I know if there are corresponding standards in w3 to stipulate it, so there is no need to comment on this point. Blame IE.
11. Why can’t the text in FF expand the height of the container?
The container with a fixed height value in standard browsers will not be expanded like in IE6, so I want to fix it again Height, how should I set it if I want it to be stretched? The way is to remove the height and set min-height:200px; here, in order to take care of IE6 that does not know min-height, it can be defined like this: >min-height:200px;
}
12. How to make continuous long fields automatically wrap under FireFox
As we all know, just use word-wrap:break-word directly in IE. In FF, we use the technique of JS inserting
to solve the problem
function toBreakWord(el, intLen){
var ōbj=document.getElementByIdx_x_xx_x_x(el);
var strContent=obj. innerHTML;
var strTemp="";
while(strContent.length>intLen){
strTemp =strContent.substr(0,intLen) "
";
strContent=strContent.substr (intLen,strContent.length);
}
strTemp="
" strContent;
obj.innerHTML=strTemp;
}
if(document.getElementByIdx_x_xx_x_x && !document.all ) toBreakWord("ff", 37);
13. Why is the width of the container under IE6 and FF interpreted differently?
The difference in the problem is whether the overall width of the container includes the width of the border. Here IE6 interprets it as 200PX, while FF interprets it as 220PX. So what exactly causes the problem? If you remove the xml at the top of the container, you will find that the original problem lies here. The statement at the top triggers IE's qurks mode.
The first one, CSS HACK
Bpx;
_height:20px;
Pay attention to the order.
The following is also a div CSS HACK, but it is not as simple as the above.
#example { color: #333; }
* html #example { color: #666; } * html #example { color: #999; }
The second method is to use IE-specific conditional CSS comments
< ![endif]-->
The third method is the css filter method. The following is translated from foreign websites.
Create a new css style as follows:
#item {
width: 200px; height: 200px;
background: red;
}
Create a new div and use the css style defined earlier:
Attribute, Chinese is zh:
Now define another style for the div element:
*:lang(en) # item{
background:green !important;}
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