DIV+CSS commonly used Html web page layout code

The following is a quotation fragment in a single row and column:
body { margin: 0px; padding: 0px; text-align: center; }
#content { margin-left:auto; margin-right:auto; width: 400px; width: 370px; }

Two rows and one column below are quotation fragments:
body { margin: 0px; padding: 0px; text-align: center;}
#content-top { margin-left:auto; margin-right:auto; width: 400px; width: 370px;}
#content-end {margin-left:auto; margin-right:auto; width: 400px; width: 370px;}

Three rows and one column below are quotation fragments:
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; width: 370px; }
#content-end { margin-left:auto; margin-right:auto; width: 400px; width: 370px; }

The following is a quote fragment on a single line and two columns:
#bodycenter { width: 700px;margin-right: auto; margin-left: auto;overflow: auto; }
#bodycenter #dv1 {float: left;width: 280px;}
#bodycenter #dv2 {float: right;width: 410px;}

Two rows and two columns below is a quote fragment:
#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: 410px;}

Three rows and two columns below are quotation fragments:
#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: 410px;}
#footer{ width: 700px; margin-right: auto; margin-left: auto; overflow: auto; }

Single row and three columns with absolute positioning. The following is a quote fragment:
#left { position: absolute; top: 0px; left: 0px; width: 120px; }
#middle {margin: 20px 190px 20px 190px; }
#right {position: absolute;top: 0px; right: 0px; width: 120px;}

float positioning one
xhtml:
Here is a quote:
<div id="warp"> <div id="column"> <div id="column1">This is the first column</div> <div id="column2">This is the second column</div> <div class="clear"></div> </div> <div id="column3">This is the third column</div> <div class="clear"></div> </div>

CSS:
Here is a quote:
#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:
The following is a quoted fragment: <div id="center" class="column"> <h1>This is the main content.</h1> </div> <div id="left" class="column"> <h2 >This is the left sidebar.</h2> </div> <div id="right" class="column"> <h2>This is the right sidebar.</h2> </div>

CSS:
Here is a quote:
body {margin: 0;padding-left: 200px;padding-right: 190px;min-width: 240px;}
.column {position: relative;float: left;}
#center {width: 100%;}
#left {width: 180px; right: 240px; margin-left: -100%;}
#right {width: 130px;margin-right: -100%;}

Two rows and three columns
xhtml: The following is a quoted fragment: <div id="header">Here is the top row</div> <div id="warp"> <div id="column"> <div id="column1">Here is the first row One column</div> <div id="column2">This is the second column</div> <div class="clear"></div> </P> <P></div> <div id= "column3">This is the third column</div> <div class="clear"></div> </div>

CSS:
Here is a quote:
#header{width:100%; height:auto;}
#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;}

Three rows and three columns
xhtml:
The following is a quoted snippet: <div id="header">Here is the top row</div> <div id="warp"> <div id="column"> <div id="column1">Here is the first column </div> <div id="column2">This is the second column</div> <div class="clear"></div> </div> <div id="column3">This is the third column </div> <div class="clear"></div> </div> <div id="footer">Here is the bottom row</div>

CSS:
Here is a quote:
#header{width:100%; height:auto;}
#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;}
#footer{width:100%; height:auto;}