It's a cliché that CSS is compatible with every browser, and the tutorials are all over the Web. The following content is not too many novel, purely personal summary, hoping to have some help for beginners.
First, CSS HACK
The following two methods can solve almost all of today's hack.
1,!important
With IE7 support for!important, the!important method is now only for IE6 hack. (Note the wording. Remember that the statement location needs to be advanced.)
2, Ie6/ie77 to Firefox
*+html and *html is the unique label of IE, Firefox is not supported. And *+html is a special label for IE7.
Attention:
*+html to IE7 hack must ensure that the HTML top has the following declaration:
Second, Universal float closed
The principle of clear float can be found in [how to clear floats without Structural Markup]
Add the following code to the global CSS and add class= "Clearfix" to the div that needs to be closed.
Third, other compatibility skills
1, FF setting padding after the div will cause width and height to increase, but IE will not. (Can be resolved with!important)
2, centering problem.
1). Center vertically. Set Line-height to the same height as the current Div, and then through Vertical-align:middle. (Note that the content does not wrap.)
2). Center horizontally. margin:0 Auto; (of course not everything)
3, if you need to give the contents of a tag style, you need to set display:block; (common in navigation labels)
4, the FF and IE to the BOX understanding of the difference caused by 2px is also set to float div under IE margin doubled and so on.
5, UL label under FF The default is List-style and padding. It is advisable to declare beforehand to avoid unnecessary trouble. (Common in navigation labels and table of contents)
6, as an external wrapper div do not set dead height, it is best to add Overflow:hidden. To achieve a high degree of self-adaptation.
7, about the hand-shaped cursor. Cursor:pointer. And hand only applies to IE.
1 CSS styles for Firefox IE6 IE7
Most are now using!important to hack, for IE6 and Firefox test can display normally,
But IE7 to!important can be correctly explained, will cause the page did not display as required! Find a needle
IE7 good hack Way is to use "*+html", now with IE7 browsing, there should be no problem.
Now write a CSS that can do this:
#1 {color: #333;}/* Moz */
* HTML #1 {color: #666;}/* IE6 */
*+html #1 {color: #999;}/* IE7 */
Then under Firefox font color display as #333,ie6 under the font color display as #666,ie7 under the font color display as #999.
2 centering issues in CSS layouts
The main style definitions are as follows:
body {text-align:center;}
#center {Margin-right:auto; Margin-left:auto; }
Description
The text-align:center is defined first in the parent element, which means that the content within the parent element is centered, and the setting for IE is already available.
But it can't be centered in Mozilla. The solution is to add "Margin-right:auto" when the child element is defined; Margin-left:auto; ”
It is necessary to note that if you want to use this method to center the entire page, it is recommended that you do not put in a div, you can sequentially split a number of Div,
Just define the Margin-right:auto in each of the split div; Margin-left:auto; You can do it.
3 box models different interpretations
#box {width:600px;//for ie6.0-w\idth:500px;//for ff+ie6.0}
#box {width:600px!important//for ff width:600px;//for ff+ie6.0 width/**/:500px;//for ie6.0-}
4 The double distance generated by the floating IE
#box {float:left; width:100px; margin:0 0 0 100px; In this case, IE will produce 200px distance display:inline; Make floating Ignore}
Here Block,inline two elements, the block element is characterized by: always start on the new line, height, width, row height, the margin can be controlled (block elements), the characteristics of the inline element is: and other elements on the same line,... Uncontrollable (inline element);
#box {display:block;//can simulate a block element display:inline for inline elements;//Achieve the effect of the same row arrangement diplay:table;
IE does not recognize the definition of min-, but in fact it treats the normal width and height as a condition of min. This is a big problem, if you only use width and height,
In the normal browser these two values will not change, if only with min-width and min-height words, ie below is basically not set width and height.
For example, to set the background image, this width is more important. To solve this problem, you can:
#box {width:80px; height:35px;} Html>body #box {width:auto; height:auto; min-width:80px; min-height:35px;}
6 minimum width of the page
Min-width is a handy CSS command that allows you to specify that the element should be minimal or less than a certain width, so that the layout is always correct. But IE does not recognize this,
And it actually puts width as the minimum width. In order to make this command available on IE, you can put atab, and then specify a class for the DIV:
Then the CSS is designed like this:
#container {min-width:600px; Width:expression (Document.body.clientWidth < 600?) "600px": "Auto");}
The first min-width is normal, but the width of line 2nd uses JavaScript, which only IE recognizes, which also makes your HTML document less formal. It actually achieves the minimum width by JavaScript's judgment.
7 Clear Float
. hackbox{display:table;//Display the object as a block-element-level table} or. hackbox{Clear:both;}
or join: After (pseudo-object), set what happens after the object, usually in conjunction with content, IE does not support this pseudo-object, non-IE browser support,
So it doesn't affect the Ie/win browser. This is the most troublesome of ... #box: after{content: "."; display:block; height:0; clear:both; visibility:hidden;}
8 div Floating IE text generates 3 pixel bug
The left object floats, the right side is positioned with the left margin of the outer patch, and the text within the right object is spaced 3px away from the left.
#box {float:left; width:800px;} #left {float:left; width:50%;} #right {width:50%;} *html #left {margin-right:-3px;//This sentence is the key}
HTML code
9 attribute Selector (this is not compatible, is a bug to hide CSS)
p[id]{}div[id]{}
This is hidden for IE6.0 and IE6.0 versions, and the FF and opera functions
There is a difference between the property selector and the child selector, the range of the child selector is reduced in form, the range of the property selector is larger, such as P[id], and all P tags have the same type of ID.
Ten IE hide and seek problems
When the div application is complex, there are some links in each column, and the div is prone to hide-and-seek problems.
Some content does not show up when the mouse selects this area is found content is indeed on the page.
WORKAROUND: Use Line-height attribute for #layout or use fixed height and width for #layout. The page structure is as simple as possible.
11 Height not adapted
Height is not adjusted when the height of the inner object changes, the outer height cannot be automatically adjusted, especially when the inner layer object uses
Margin or paddign.
Cases:
The contents of the P object
CSS: #box {background-color: #eee;}
#box p {margin-top:20px;margin-bottom:20px; text-align:center;}
Workaround: Add 2 empty div object CSS code to the P object:. 1{height:0px;overflow:hidden;} Or add the border attribute to the Div.
