CSS Reference

"border-width" - css property (v. css 1)

Possible width values:

Values Comments CSS
thin, medium or thick The width of the keyword values are UA dependent, but the following holds: 'thin' <= 'medium' <= 'thick'. 1
length With this you specify a value with a unit identifier. 1
inherit Will inherit the value from parent specification. This property value is new with CSS 2. 2

Possible unit identifier:

unit identifier Comments CSS
em The relative unit 'em' is relative to the font size of the element itself. 1
ex The relative unit 'ex' is relative to the font size of the element itself. 1
px Pixels, relative to the viewing device 1
in inches -> 1 inch is equal to 2.54 centimeters. 1
cm centimeters. 1
mm millimeters. 1
pt points -> the points used by CSS2 are equal to 1/72th of an inch. 1
pc picas -> 1 pica is equal to 12 points. 1

You can set one to four values:

Amount of values Result of setting values
value When you specify only one value, then all the border widths will be set to this value.
value1 value2 When you specify two values, then the top and the bottom border width is set to value1 and left and right border width will be set to value2.
value1 value2 value3 When you specify three values, then the top border width will be set to value1, left and right border width will be set to value2 and the bottom border width will be set to value3.
value1 value2 value3 value4 When you specify four values, then the top border width will be set to value1, the right border width will be set to value2, the bottom border width will be set to value3 and the left border width will be set to value4.

Property "border-width" example:

<!DOCTYPE HTML >
<html  >
  <head>
    <title>Test</title>
    <style type="text/css">
      .presentation {
        border-color: #aad5ff;
        border-style: solid;    }
      table.presentation {
        border-width: 0 0 1px 1px;
        width: 500px;   }
      th.presentation, td.presentation {
        border-width: 1px 1px 0 0;
        padding: 4px 4px 4px 4px;      }
      th.presentation { background-color: #D4FFAA;}
    </style>
  </head>
  <body>
    <table class='presentation'  border='0'
           cellpadding='0' cellspacing='0' >
      <tr>
        <th class='presentation' style="width: 22%">Values</th>
        <th class='presentation'>Comments</th>
        <th class='presentation'>CSS</th>
      </tr>
      <tr>
        <td class='presentation'>thin, medium or thick</td>
        <td class='presentation'>The width of the keyword
          values are UA dependent,
          but the following holds: <b>'thin' <= 'medium'
            <= 'thick'</b>. </td>
        <td class='presentation'>1</td>
      </tr>
      <tr>
        <td class='presentation'>length</td>
        <td class='presentation'>With this you specify a
          value with a <b>unit identifier</b>. </td>
        <td class='presentation'>1</td>
      </tr>
      <tr>
        <td class='presentation'>inherit</td>
        <td class='presentation'>Will inherit the value from
          parent specification. This property value is new
          with CSS 2.</td>
        <td class='presentation'>2</td>
      </tr>
    </table>
  </body>
</html>
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