CSS border-block-style Property Reference

The CSS border-block-style property is a standard property in CSS Logical Properties and Values. Review its formal syntax, computed behavior, and practical declarations.

Updated 2026-08-12

border-block-style overview

The CSS border-block-style property is a standard property in CSS Logical Properties and Values. Review its formal syntax, computed behavior, and practical declarations.

The property is not inherited by default. Use an explicit global keyword when inheritance is intended.

Syntax and formal definition

border-block-style formal syntax

Field	Value
Formal syntax	<'border-top-style'>{1,2}
Initial value	border-block-start-style, border-block-end-style
Applies to	allElements
Inherited	No
Percentages	no
Computed value	border-block-start-style, border-block-end-style
Animation type	discrete
Media	visual
Specification group	CSS Logical Properties and Values
Status	Standard

Practical examples

These declarations demonstrate valid ways to set border-block-style. The initial and inherit global keywords remain available even when a property-specific value is preferable.

border-block-style live example

CSS

.reset-example {
  border-block-style: initial;
}

.inherit-example {
  border-block-style: inherit;
}

@supports (border-block-style: initial) {
  .supported {
    border-block-style: initial;
  }
}