Example: DIV CSS Web page layout commonly used methods and techniques

css| Skills | Web page common methods for CSS layout
Float:none|left|right
Take value:
None: default value. object does not float
Left: text flows to the right of the object
Right: text flows to the left of the object

How does it work, look at a row and two columns of examples
XHTML code:
<div id= "Wrap" >
<div id= "Column1" > here is the first column </div>
<div id= "Column2" > here is the second column </div>
<div class= "Clear" ></div>/* This is contrary to the Web standard intent, just to show that the elements underneath it need to be cleared for floating * *
</div>

CSS code:
#wrap {Width:100;height:auto;}
#column1 {float:left;width:40;}
#column2 {float:right;width:60;}
. Clear{clear:both;}


position:static|absolute|fixed|relative
Take value:
Static: default value. No special location, objects follow HTML positioning rules
Absolute: drag objects out of the document stream, using attributes such as Left,right,top,bottom to be absolutely positioned relative to the parent object closest to one of the most positioned settings. If no such parent object exists, it is based on the body object. And its cascade is defined by the Z-index property
Fixed: not supported. Object positioning conforms to an absolute (absolute) approach. But there are some rules to follow.
Relative: objects cannot be stacked, but will be offset in the normal document stream based on attributes such as Left,right,top,bottom

It to implement an example of a row and two columns
XHTML code:
<div id= "Wrap" >
<div id= "Column1" > here is the first column </div>
<div id= "Column2" > here is the second column </div>
</div>

CSS code:
#wrap {position:relative;/* relative positioning */width:770px;}
#column1 {position:absolute;top:0;left:0;width:300px;}
#column2 {position:absolute;top:0;right:0;width:470px;}

What is the difference between them?
Obviously, float is relative positioning, will change with the browser size and resolution changes, and position is not, so generally or float layout!

CSS Common layout instances
Single row one column
Body{margin:0px;padding:0px;text-align:center;}
#content {margin-left:auto;margin-right:auto;width:400px;}
two rows and one column
Body{margin:0px;padding:0px;text-align:center;}
#content-top{margin-left:auto;margin-right:auto;width:400px;}
#content-end{margin-left:auto;margin-right:auto;width:400px;}
three rows one column
Body{margin:0px;padding:0px;text-align:center;}
#content-top{margin-left:auto;margin-right:auto;width:400px;width:370px;}
#content-mid{margin-left:auto;margin-right:auto;width:400px;}
#content-end{margin-left:auto;margin-right:auto;width:400px;}
single row two columns
#bodycenter {Width:700px;margin-right:auto;margin-left:auto;overflow:auto;}
#bodycenter #dv1{float:left;width:280px;}
#bodycenter #dv2{float:right;width:420px;}
two rows, two columns.
#header {Width:700px;margin-right:auto;margin-left:auto;overflow:auto;}
#bodycenter {Width:700px;margin-right:auto;margin-left:auto;overflow:auto;}
#bodycenter #dv1{float:left;width:280px;}
#bodycenter #dv2{float:right;width:420px;}
three rows, two columns
#header {Width:700px;margin-right:auto;margin-left:auto;}
#bodycenter {Width:700px;margin-right:auto;margin-left:auto;}
#bodycenter #dv1{float:left;width:280px;}
#bodycenter #dv2{float:right;width:420px;}
#footer {Width:700px;margin-right:auto;margin-left:auto;overflow:auto;clear:both;}

single row three columns
Absolute positioning
#left {position:absolute;top:0px;left:0px;width:120px;}
#middle {margin:0px190px0px190px;}
#right {position:absolute;top:0px;right:0px;width:120px;}

float Positioning One
XHTML code:
<div id= "Wrap" >
<div id= "column" >
<div id= "Column1" > here is the first column </div>
<div id= "Column2" > here is the second column </div>
<div class= "Clear" ></div>/* usage Web standards are not recommended, but remember that the following elements need to be cleared for floating * *
</div>
<divid= "Column3" > here is the third column </div>
<divclass= "Clear" ></div>/* usage Web standards are not recommended, but remember that the following elements need to be cleared for floating * *
</div>
CSS code:
#wrap {Width:100;height:auto;}
#column {float:left;width:60;}
#column1 {float:left;width:30;}
#column2 {float:right;width:30;}
#column3 {float:right;width:40;}
. Clear{clear:both;}

Float Positioning two
XHTML code:
<div id= "center" class= "column" >
</div>
<div id= "left" class= "column" >
</div>
<div id= "Right" class= "column" >
</div>
CSS code:
body{
margin:0;
padding-left:200px;/*lcfullwidth*/
Padding-right:190px;/*rcfullwidth ccpadding*/
Min-width:200px;/*lcfullwidth ccpadding*/
}
. column{
position:relative;
Float:left;
}
#center {
width:100;
}
#left {
width:200px;/*lcwidth*/
right:200px;/*lcfullwidth*/
margin-left:-100;
}
#right {
width:190px;/*rcwidth*/
margin-right:-100;
}