Appearance:
 border-top-width: <value>
Possible Values:
 thin | medium | thick | <length>
Initial Value:
 medium
Applies to:
 All elements
Inherited:
 No

The border-top-width property is used to specify the width of an element's top border. The value may be one of three keywords, which are not affected by font size, or a length, which can be used to achieve relative widths. Negative values are not allowed.

One may also use the border-top, border-width, or border shorthand properties.
Example:

<a style="border:solid 1px #ff0000;border-top-width:20px;">This is an example<\a>||||

Would display:

This is an example||||