How to fix the height of the rowspaned TD in a table

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We are developing a HTML page like excel with HTML Table,user can merge some TDs in the rows or columns,in the merged TD, we insert some DIV for some purpose,this DIV's CSS uses the 'height: calc(100% + 6px)'.
Problem: when the size of chrome browser is changed,the the merged TD's height will change higher automatically.
we found that maybe it because the 'calc(100% + 6px)',but how to fix the TD's height? Thanks a lot!
some code like this:

HTML

<html xmlns="http://www.w3.org/1999/xhtml">
<head>

 <title></title>
 <style type="text/css">
  html, body, form
  {
   height: 100%;
   margin: 0;
   padding: 0;
  } 
#mainTable td>div{
	position: relative;
	left: -3px;
	top: 0px;
	width: -webkit-calc(100% + 6px);
	height: -webkit-calc(100% + 6px);
	width: calc(100% + 6px);
	height: calc(100% + 6px);
	border:1px solid blue;
	background-color: rgba(255, 255, 255, 0) !important;
	overflow: visible;
	/*overflow: hidden; */
}
#mainTable td>div>.borderControl{
	position: relative;
	left: 1px;
	top: 1px;
	width: -webkit-calc(100% - 2px);
	height: -webkit-calc(100% - 2px);
	width: calc(100% - 2px);
	height: calc(100% - 2px);
	border:1px solid red;
	box-sizing: border-box;
  -moz-box-sizing: border-box;
	-webkit-box-sizing: border-box;
	overflow: hidden;
}
#mainTable{
	box-sizing:border-box;
	border-collapse: collapse; 
	width: 500px; 
	height: 10px;
	table-layout: fixed;
	}
#mainTable td>div>.borderControl>div{
	position: relative;	
	height: 0;
	width: -webkit-calc(100% - 3px);
}

tr{
	height:24px;
	}
  td{
  	border: 1px solid Silver;
  	width:180px;
  	}
  	.borderContainer{
	width: 100%;
	height: 100%;
	margin: 0px;
	padding: 0px;
	overflow: hidden;
}

  </style>

</head>

<body>
 <table id="mainTable"  >
<tr> 
  	<td >  </td> 
    <td >  </td>
    <td >  </td>
  </tr>
  <tr> 
  	<td >  </td>  
  	<td  rowspan="2" style="height:50px !important">
     <div ><div class="borderControl"><div></div><div class="widgetBox"></div></div><span></span><span></span><span></span><span></span></div>
   </td>
  	<td >  </td> 
  </tr>

  <tr>   	
  	<td >  </td> 
  	<td >  </td>
  </tr>

  <tr> 
  	<td >  </td> 
  	<td >  </td> 
  	<td >  </td> 
  </tr>
 </table>

</body>

</html>

Posted 25-Aug-14 1:25am

charlesmu99

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charlesmu99 · Accepted Answer · 2014-08-25T05:59:00

I got it,just not use the calc function in the CSS '#mainTable td>div':

HTML

#mainTable td>div{
position: relative;
left:0px;
top:0px;
border:0;
width: 100% ;
height: 100%;
background-color: rgba(255, 255, 255, 0) !important;	
overflow: visible;
}
#mainTable td>div>.borderControl{
	position: relative;	
        left: -2px;	
        top: -2px ;	
        width: calc(100% + 4px);	
        height: calc(100% + 4px);	
	border:1px solid red;
	box-sizing: border-box;
        -moz-box-sizing: border-box;
	-webkit-box-sizing: border-box;
	overflow: hidden;
}