CSS border-top-width Property

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h1 {
  border-top-style: dashed;
  border-top-width: thick;

div {
  border-style: solid;
  border-top-style: dotted;
  border-top-width: thin;

Hello World!


The border-top-width CSS property sets the width of the top border of an element.

Default value:medium
JavaScript syntax:

Standard Syntax

border-top-width: medium|thin|thick|length|initial|inherit|revert|revert-layer|unset;

Browser Support

The numbers in the table specify the first browser version that fully supports the property.


Property Values

The following table describes the values of this property.

Value Description
medium This is default. Specifies a medium top border.
thin Specifies a thin top border.
thick Specifies a thick top border.
length Specifies a length value in px, pt, cm, em, etc. Negative values are not allowed.
initial Sets this property to its default value.
inherit If specified, the associated element takes the computed value of its parent element animation-delay property.
revert Reverts the cascaded value of the property from its current value to the value the property
revert-layer Rollback styles to the ones specified in previous cascade layers.
unset Resets a property to its inherited value if the property naturally inherits from its parent, and to its initial value if not.

Default CSS Property Values

selectors {
  border-top-width: medium;
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