HTML table pure CSS fixed header

This is a, slightly hackish, pure CSS implementation of a fixed table header. It is implemented in HTML5 and CSS3 and is tested in FX 25, Chrome 31 and IE 10.

HTML

<section class="">
  <div class="container">
    <table class="fixed_headers">
      <thead>
        <tr class="header">
          <th>
         
            <div>Table attribute name</div>
          </th>
          <th>
          
            <div>Table attribute name</div>
          </th>
          <th>
         
            <div>Value</div>
          </th>
          <th>
      
            <div>Description</div>
          </th>
        </tr>
      </thead>
      <tbody>
        <tr>
          <td>align</td>
          <td>left, center, right</td>
          <td>Not supported in HTML5. Deprecated in HTML 4.01. Specifies the alignment of a table according to surrounding text</td>
           <td>align</td>
        </tr>
        <tr>
          <td>bgcolor</td>
          <td>rgb(x,x,x), #xxxxxx, colorname</td>
          <td>Not supported in HTML5. Deprecated in HTML 4.01. Specifies the background color for a table</td>
        </tr>
        <tr>
          <td>border</td>
          <td>1,""</td>
          <td>Specifies whether the table cells should have borders or not</td>
           <td>align</td>
        </tr>
        <tr>
          <td>cellpadding</td>
          <td>pixels</td>
          <td>Not supported in HTML5. Specifies the space between the cell wall and the cell content</td>
        </tr>
        <tr>
          <td>cellspacing</td>
          <td>pixels</td>
          <td>Not supported in HTML5. Specifies the space between cells</td>
           <td>align</td>
        </tr>
        <tr>
          <td>frame</td>
          <td>void, above, below, hsides, lhs, rhs, vsides, box, border</td>
          <td>Not supported in HTML5. Specifies which parts of the outside borders that should be visible</td>
        </tr>
        <tr>
          <td>rules</td>
          <td>none, groups, rows, cols, all</td>
          <td>Not supported in HTML5. Specifies which parts of the inside borders that should be visible</td>
           <td>align</td>
        </tr>
        <tr>
    ...

CSS

.fixed_headers {
  width: 750px;
  table-layout: fixed;
  border-collapse: collapse;
}
.fixed_headers th {
  text-decoration: underline;
}
.fixed_headers th,
.fixed_headers td {
  padding: 5px;
  text-align: left;
}
.fixed_headers td:nth-child(1),
.fixed_headers th:nth-child(1) {
  min-width: 200px;
}
.fixed_headers td:nth-child(2),
.fixed_headers th:nth-child(2) {
  min-width: 200px;
}
.fixed_headers td:nth-child(3),
.fixed_headers th:nth-child(3) {
  width: 350px;
}
.fixed_headers thead {
  background-color: #333;
  color: #FDFDFD;
}
.fixed_headers thead tr {
  display: block;
  position: relative;
}
.fixed_headers tbody {
  display: block;
  overflow: auto;
  width: 100%;
  height: 300px;
}
.fixed_headers tbody tr:nth-child(even) {
  background-color: #DDD;
}
.old_ie_wrapper {
  height: 300px;
  width: 750px;
  overflow-x: hidden;
  overflow-y: auto;
}
.old_ie_wrapper tbody {
  height: auto;
}