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<p>From <b>http://www.w3schools.com</b> (Copyright Refsnes Data)</p>
<h1>CSS Units</h1>
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<h3>Measurements</h3>
<table class="ex" cellspacing="0" border="1" width="100%" cellpadding="3">
<tr>
<th align="left" width="25%">Unit</th>
<th align="left" width="75%">Description</th>
</tr>
<tr>
<td valign="top">%</td>
<td valign="top">percentage</td>
</tr>
<tr>
<td valign="top">in</td>
<td valign="top">inch</td>
</tr>
<tr>
<td valign="top">cm</td>
<td valign="top">centimeter</td>
</tr>
<tr>
<td valign="top">mm</td>
<td valign="top">millimeter</td>
</tr>
<tr>
<td valign="top">em</td>
<td valign="top">1em is equal to the current font size. 2em means 2 times
the size of the current font. E.g., if an element is displayed with a font
of 12 pt, then '2em' is 24 pt. The 'em' is a very useful unit in CSS, since
it can adapt automatically to the font that the reader uses</td>
</tr>
<tr>
<td valign="top">ex</td>
<td valign="top">one ex is the x-height of a font (x-height is usually
about half the font-size)</td>
</tr>
<tr>
<td valign="top">pt</td>
<td valign="top">point (1 pt is the same as 1/72 inch)</td>
</tr>
<tr>
<td valign="top">pc</td>
<td valign="top">pica (1 pc is the same as 12 points)</td>
</tr>
<tr>
<td valign="top">px</td>
<td valign="top">pixels (a dot on the computer screen)</td>
</tr>
</table>
<h3>Colors</h3>
<table class="ex" cellspacing="0" border="1" width="100%" cellpadding="3">
<tr>
<th align="left" width="25%">Unit</th>
<th align="left" width="75%">Description</th>
</tr>
<tr>
<td valign="top"><i>color_name</i></td>
<td valign="top">A color name (e.g. red)</td>
</tr>
<tr>
<td valign="top">rgb(x,x,x)</td>
<td valign="top">An RGB value (e.g. rgb(255,0,0))</td>
</tr>
<tr>
<td valign="top">rgb(x%, x%, x%)</td>
<td valign="top">An RGB percentage value (e.g. rgb(100%,0%,0%))</td>
</tr>
<tr>
<td valign="top">#rrggbb</td>
<td valign="top">A HEX number (e.g. #ff0000)</td>
</tr>
</table>
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<p>From <b>http://www.w3schools.com</b> (Copyright Refsnes Data)</p>
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