|Possible Values:||thin | medium | thick | <length>
|Applies to:||All elements
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.
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