border-block-style

Sets the line style for both block-dimension borders (top and bottom) with one declaration. Using 'solid' is the most common way to define these boundaries.

It is documented as part of the CSS Logical Properties and Values specification.

/* Usage Example */
.content-block {
  border-block-style: solid;
  border-block-width: 1px;
  border-block-color: #ccc;
}

/* Syntax */
border-block-style: border-top-style;

/* Global values */
border-block-style: inherit;
border-block-style: initial;
border-block-style: revert;
border-block-style: revert-layer;
border-block-style: unset;
Widely available Since 2021 95% global usage

This feature is well established and works across many devices and browser versions. It has been available across browsers since 2021.

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