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This property defines the width of the top border of the element.


This property accepts one of the keyword values: thin, medium or thick. Other than these, it can also accept any length value.

/* Setting the top border to be thick */
border-top-width: thick;

/* Setting a length value: */
border-top-width: 4px;
border-top-width: 0.5em;


Same values apply as with the border-width property. It can be thin, medium or thick as a keyword value or any type of length value (example: 15px or 1.3rem).

Global CSS keyword – this sets the property to the default value.

Global CSS keyword – this sets the property to be inherited from its parent element.

Browser Compatibilty


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