html - Adjust width of td with rotated headers -

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i have table uses javascript show or hide columns. column headers rotated 90 degrees.

everything works functionally, there 1 issue haven't been able figure out. width of columns should 20px. appears width of column equal of div before rotated.

i have tried adjusting width of div inside tds 20px. in case width of column correctly adjusts 20px, header text appears cut off. i've tried compensating via setting overflow: visible; when columns visible, appears change actual position of header divs. idea how can working?

here code (background colors added visualize position of div relative td). 

function showhidematrix() {      var privcells = document.getelementsbyclassname('privcol');      var privmatrixcells = document.getelementsbyclassname('privmatrixcol');        (var = 0, ilen = privcells.length; < ilen; i++) {          if (privcells[i].style.height === '' || privcells[i].style.height != '0px') {              privcells[i].style.height = '0px';              privcells[i].style.width = '0px';          } else {              if(privcells[i].classname.indexof('privhead') > -1){                  privcells[i].style.height = '20px';                  privcells[i].style.width = '150px';              } else {                  privcells[i].style.height = '20px';                  privcells[i].style.width = '20px';              }          }      }            (var j = 0, ilen1 = privmatrixcells.length; j < ilen1; j++) {          if (privmatrixcells[j].style.height === '' || privmatrixcells[j].style.height == '0px') {              if(privmatrixcells[j].classname.indexof('privhead') > -1){                  privmatrixcells[j].style.height = '20px';                  privmatrixcells[j].style.width = '150px';              } else {                  privmatrixcells[j].style.height = '20px';                  privmatrixcells[j].style.width = '20px';                              }          } else {              privmatrixcells[j].style.height = '0px';              privmatrixcells[j].style.width = '0px';          }      }  }
.privhead {      /* rotation */      -ms-transform: rotate(90deg); /* ie9+ */      -webkit-transform: rotate(90deg); /* safari 3.1+, chrome */      -moz-transform: rotate(90deg); /* ff3.5+ */      -o-transform: rotate(90deg); /* opera 10.5 */      transform: rotate(90.0deg); /* standard */      filter: progid:dximagetransform.microsoft.basicimage(rotation=0.083); /* ie6,ie7 */      -ms-filter:"progid:dximagetransform.microsoft.basicimage(rotation=0.083)"; /* ie8 */      //transform-origin: center center;      /* text */      overflow: hidden;      font-family: verdana, arial, helvetica;      font-size: 10pt;      font-weight: bold;      //height: 20px;      width: 150px;      text-align: left;      //position: relative;  }    .privcol {      /* transition */      -webkit-transition: 0.8s;      -moz-transition: 0.8s;      -o-transition: 0.8s;      -ms-transition: 0.8s;      transition: 0.8s;      vertical-align: bottom;          text-align: left;      overflow: hidden;  }  .privmatrixcol {      /* transition */      -webkit-transition: 0.8s;      -moz-transition: 0.8s;      -o-transition: 0.8s;      -ms-transition: 0.8s;      transition: 0.8s;            width: 0px;      overflow: hidden;      margin: auto;  }    .privtext{      width: 100%;  }  table{      width: 400px;  }  table, tr, td {      border: 1px solid black;      border-collapse: collapse;      padding: 0;      border-spacing: 0px;  }
<table id="table0" style="margin-top: 100px;">      <thead>          <tr>              <td colspan="4">                       <button onclick="showhidematrix()" href="">matrix</button>              </td>          </tr>      </thead>      <tbody id="body0">          <tr>              <td style="background-color: lightblue; height: 150px;">                  <div class="privhead privcol" style="background-color: lightgreen; width: 150px; position: relative;">request</div>              </td>              <td style="background-color: lightblue; height: 150px;">                  <div class="privhead privcol" style="background-color: lightgreen; position: relative;">recommend</div>              </td>              <td style="background-color: lightblue; height: 150px; width: 0px;">                  <div class="privhead privmatrixcol" style="background-color: lightgreen;">demo</div>              </td>              <td></td>          </tr>          <tr>              <td>                  <div class="privcol" style="text-align: center;">                      <input type="checkbox" checked="checked" />                  </div>              </td>              <td>                  <div class="privcol" style="text-align: center;">                      <input type="checkbox" />                  </div>              </td>              <td>                  <div class="privmatrixcol" style="text-align: center;">&#8226;</div>              </td>              <td>                  <div class="privtext">priv 2</div>              </td>          </tr>      </tbody>  </table>

http://jsfiddle.net/namyzarc/qnfe3bde/


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