<table cellspacing="0" class="table">
  <tr>
    <th>Fruits</th>
    <th>Vegetables</th>
    <th>Rocks</th>
  </tr>
  <tr>
    <td>Apple</td>
    <td>Celery</td>
    <td>Granite</td>
  </tr>
  <tr>
    <td>Orange</td>
    <td>Cabbage</td>
    <td>Flint</td>
  </tr>
</table>

<p><button>COLLAPSE ROW 1</button></p>

<p><button>HIDE ROW 1</button></p>

<p><button>RESET</button></p>

<p>See <a href="http://www.sitepoint.com/12-little-known-css-facts/">article</a>.</p>

body {
  text-align: center;
  padding-top: 20px;
  font-family: Arial, sans-serif;
}

table {
  border-collapse: separate;
  border-spacing: 5px;
  border: solid 1px black;
  width: 500px;
  margin: 0 auto;
}

th, td {
  text-align: center;
  border: solid 1px black;
  padding: 10px;
}

.vc {
  visibility: collapse;
}

.vh {
  visibility: hidden;
}

button {
  margin-top: 5px;
}

var btns = document.getElementsByTagName('button'),
    rows = document.getElementsByTagName('tr');

btns[0].addEventListener('click', function () {
  rows[1].className = 'vc';
}, false);

btns[1].addEventListener('click', function () {
  rows[1].className = 'vh';
}, false);

btns[2].addEventListener('click', function () {
  rows[1].className = '';
}, false);