Detailed explanation of the role of attribute zoom: 1 in CSS styles

The role of zoom:1 in CSS
Compatible with IE6, IE7, and IE8 browsers, you often encounter some problems, you can use zoom:1 to solve them, there are The following functions:
Trigger the haslayout of IE browser
Solve some problems such as floating and margin overlap under IE.
For example, this site uses p to display one row and two columns. HTML code:

<div class="h_mainbox"> 
<h2 id="推荐文章">推荐文章</h2> 
<ul class="mainlist"> 
<li><a href="#" style="color:#0000FF" target="_blank">CSS库吧</a></li> 
<li><a href="#" style="color:#0000FF" target="_blank">原创< /a></li> 
</ul> 
</div>

CSS code:

.h_mainbox { 
border:1px solid #dadada; padding:4px 15px; background:url(../mainbox_bg.gif) 0 1px repeat-x; margin-bottom:6px; overflow:hidden}
 .h_mainbox h2
 { font-size:12px; height:30px; line-height:30px; border-bottom:1px solid #ccc; color:#555;} .h_mainbox h2 span { float:right; font-weight:normal;}
 .h_mainbox ul { 
padding:6px 0px; background:#fff;}
 .mainlist { 
overflow:auto; zoom:1;}
 .h_mainbox li { 
width:268px; 
float:left; 
height:24px; 
overflow:hidden; 
background:url(../icon3.gif) 0 6px no-repeat; 
padding:0px 5px 0px 18px; 
line-height:200%;}

Add red to display normally in IE6, IE7, and IE8 .

Add red to display the effect normally in IE6, IE7, and IE8.
The role of zoom in css
1. Check whether the label of the page is closed
Don't underestimate this, maybe the CSS BUG problem that you have not solved for two days only comes from this. After all, page templates are usually nested by developers, and they can easily make such problems.
Quick tip: You can use Dreamweaver to open the file to check. Generally, if there are no closed tags, they will be highlighted with a yellow background.

　2. Style elimination method
Some complex pages may load N external link CSS files, then delete the CSS files one by one, find the specific CSS files triggered by the BUG, ​​and narrow the scope of locking.

For the problematic CSS style file just locked, delete the specific style definitions line by line, locate the specific trigger style definition, and even the specific trigger style attributes.

　3. Module confirmation method
Sometimes we can also start from the HTML elements of the page. Delete different HTML modules in the page and find the HTML module that triggers the problem.

　4. Check whether floats are cleared
In fact, there are many CSS BUG problems caused by not clearing floats. It is necessary to develop a good habit of clearing floats. It is recommended to use a method of clearing floats without additional HTML tags (try to avoid using similar methods like overflow:hidden;zoom:1 to clear floats, which will be too restrictive).

　5. Check whether haslayout is triggered under IE
Many complex CSS BUGs under IE are closely related to IE's unique haslayout. Familiarity and understanding of haslayout will help you solve complex CSS bugs with less effort. It is recommended to read "On having layout" translated by old9 (if you can't cross the great GFW, you can read the repost on the blue)
Quick tip: If haslayout is triggered, go to the properties in IE's debugging tool IE Developer Toolbar It will show that the haslayout value is -1.

　6. Border and background debugging method
So the name suggests is to set a conspicuous border or background (usually black or red) for the element for debugging. This method is one of the most commonly used methods for debugging CSS bugs, and it is still applicable to complex bugs. Affordable and environmentally friendly^^
The last thing I want to emphasize is that developing good writing habits, reducing extra tags, trying to be as semantic as possible, and complying with standards can actually save us a lot of extra complex CSS BUGs. In fact, more often than not, It is we who create the trouble for ourselves. I hope you stay away from bugs and your life becomes better and better.

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