CSS Unit

CSS px pt em difference

by allen Yu

HTML

<table class="conversion-table base-table">
  <colgroup>
    <col class="c25">
      <col class="c25">
        <col class="c25">
          <col class="c25">
  </colgroup>
  <thead>
    <tr>
      <th>Pixels</th>
      <th>EMs</th>
      <th>Percent</th>
      <th>Points</th>
    </tr>
  </thead>
  <tbody>
    <tr class="odd">
      <td>6px</td>
      <td>0.375em</td>
      <td>37.5%</td>
      <td>5pt</td>
    </tr>
    <tr class="even">
      <td>7px</td>
      <td>0.438em</td>
      <td>43.8%</td>
      <td>5pt</td>
    </tr>
    <tr class="odd">
      <td>8px</td>
      <td>0.500em</td>
      <td>50.0%</td>
      <td>6pt</td>
    </tr>
    <tr class="even">
      <td>9px</td>
      <td>0.563em</td>
      <td>56.3%</td>
      <td>7pt</td>
    </tr>
    <tr class="odd">
      <td>10px</td>
      <td>0.625em</td>
      <td>62.5%</td>
      <td>8pt</td>
    </tr>
    <tr class="even">
      <td>11px</td>
      <td>0.688em</td>
      <td>68.8%</td>
      <td>8pt</td>
    </tr>
    <tr class="odd">
      <td>12px</td>
      <td>0.750em</td>
      <td>75.0%</td>
      <td>9pt</td>
    </tr>
    <tr class="even">
      <td>13px</td>
      <td>0.813em</td>
      <td>81.3%</td>
      <td>10pt</td>
    </tr>
    <tr class="odd">
      <td>14px</td>
      <td>0.875em</td>
      <td>87.5%</td>
      <td>11pt</td>
    </tr>
    <tr class="even">
      <td>15px</td>
      <td>0.938em</td>
      <td>93.8%</td>
      <td>11pt</td>
    </tr>
    <tr class="odd selected base">
      <td>16px</td>
      <td>1.000em</td>
      <td>100.0%</td>
      <td>12pt</td>
    </tr>
    <tr class="even">
      <td>17px</td>
      <td>1.063em</td>
      <td>106.3%</td>
      <td>13pt</td>
    </tr>
    <tr class="odd">
      <td>18px</td>
      <td>1.125em</td>
      <td>112.5%</td>
      <td>14pt</td>
    </tr>
    <tr class="even">
      <td>19px</td>
      <td>1.188em</td>
      <td>118.8%</td>
      <td>14pt</td>
    </tr>
    <tr class="odd">
      <td>20px</td>
      <td>1.250em</td>
  ...

CSS

* {
  position;
  relative;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  padding: 0;
  margin: 0;
}

table {
  display: table;
}

.conversion-table {
  width: 100%;
  border-collapse: collapse;
  border-spacing: 0;
  border: none;
}

.conversion-column {
  height: 502px;
  background-color: #fff;
  background-image: -moz-linear-gradient(top, #fff 0%, #eee 100%);
  background-image: -webkit-linear-gradient(top, #fff 0%, #eee 100%);
  background-image: -o-linear-gradient(top, #fff 0%, #eee 100%);
  background-image: -ie-linear-gradient(top, #fff 0%, #eee 100%);
  background-image: linear-gradient(top, #fff 0%, #eee 100%);
  color: #222;
  border-bottom: 2px solid #000;
}

.conversion-table td,
.conversion-table th {
  width: 25%;
  padding: 4px 8px;
}

.conversion-table td {
  border-bottom: 1px solid rgba(0, 0, 0, .1);
}

.conversion-table th {
  background-color: #ccc;
  background-image: -moz-linear-gradient(top, rgba(255, 255, 255, 1) 0%, rgba(255, 255, 255, 0) 100%);
  background-image: -webkit-linear-gradient(top, rgba(255, 255, 255, 1) 0%, rgba(255, 255, 255, 0) 100%);
  background-image: -o-linear-gradient(top, rgba(255, 255, 255, 1) 0%, rgba(255, 255, 255, 0) 100%);
  background-image: -ie-linear-gradient(top, rgba(255, 255, 255, 1) 0%, rgba(255, 255, 255, 0) 100%);
  background-image: linear-gradient(top, rgba(255, 255, 255, 1) 0%, rgba(255, 255, 255, 0) 100%);
  border-bottom: 1px solid #999;
  border-left: 1px solid #ccc;
}

.even {
  background-color: rgba(0, 0, 0, .05);
}

.base-table tbody tr:hover,
.base-table .selected,
.base-table .base.selected {
  cursor: pointer;
  background-color: #0099cc;
  color: #fff;
  text-shadow: rgba(0, 0, 0, .7) 0 1px 0;
  background-image: -moz-linear-gradient(top, rgba(255, 255, 255, .2) 0%, rgba(255, 255, 255, 0) 100%);
  background-image: -webkit-linear-gradient(top, rgba(255, 255, 255, .2) 0%, rgba(255, 255, 255, 0) 100%);
  background-image: -o-linear-gradient(top,...