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Monday, September 20, 2010

Learn CSS DIVs

float columns

If we float one column to the left, then also float the second column to the left, they will push up against each other.

#div-1a { 
float:left;
width:150px;
}

#div-1b {
float:left;
width:150px;
}

http://www.barelyfitz.com/screencast/html-training/css/positioning/ go to tab 8



two column absolute

Now we can make a two-column layout using relative and absolute positioning!

#div-1 {  position:relative; } #div-1a {  position:absolute;  top:0;  right:0;  width:200px; } #div-1b {  position:absolute;  top:0;  left:0;  width:200px; } 

One advantage to using absolute positioning is that we can position the elements in any order on the page, regardless of the order they appear in the HTML. So I put div-1b before div-1a.

But wait - what happened to the other elements? They are being obscured by the absolutely positioned elements. What can we do about that?


two column absolute height

One solution is to set a fixed height on the elements.

But that is not a viable solution for most designs, because we usually do not know how much text will be in the elements, or the exact font sizes that will be used.

#div-1 {  position:relative;  height:250px; } #div-1a {  position:absolute;  top:0;  right:0;  width:200px; } #div-1b {  position:absolute;  top:0;  left:0;  width:200px; }


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