CSS+DIV样式时,如果div值为空,仍然占位。CSS大神来看看!!
<html>
    <head>
        <title></title>
		<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
		<style>
			.div_tab {
			}
			.div_tab .cell {
				float: left;
				margin-left: 5px;
				word-break: break-all;
				word-wrap: break-word;                                             
			}
			/* 五列 */
			.div_tab .cell.w_03 {
				width: 17%
			}
			.clear {zoom:1; clear:both;}
		</style>
    </head>
    <body>
		<hr />
		<div class="div_tab">
			<div class="cell w_03">XXXXXX</div>
			<div class="cell w_03">XXXXXX</div>
			<div class="cell w_03">XXXXXX</div>
			<div class="cell w_03">XXXXXX</div>
			<div class="cell w_03">XXXXXX</div>
			<div class="clear" />
			<div class="cell w_03">XXXXXX</div>
			<div class="cell w_03">XXXXXX</div>
			<div class="cell w_03">XXXXXX</div>
			<div class="cell w_03">XXXXXX</div>
			<div class="cell w_03">XXXXXX</div>
			<div class="clear" />
			<div class="cell w_03">XXXXXX</div>
			<div class="cell w_03">XXXXXX</div>
			
<div class="cell w_03"></div>
			<div class="cell w_03"></div>
			<div class="cell w_03">XXXXXX</div>
		</div>
	  
    </body>
</html>

红字部分值为空时,后面的会占据前面的空值得位置。
现在的要求就是空的值 空着 但是还是占据着位置  xxxxx
第三行的  第三四列为空 ,第五列 才显示 
              
------解决方案--------------------div给min-height:1px;