CSS inline-size Property Reference

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

Updated 2026-08-12

inline-size overview

The CSS inline-size 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

inline-size formal syntax

Field	Value
Formal syntax	<'width'>
Initial value	auto
Applies to	sameAsWidthAndHeight
Inherited	No
Percentages	inlineSizeOfContainingBlock
Computed value	sameAsWidthAndHeight
Animation type	lpc
Media	visual
Specification group	CSS Logical Properties and Values
Status	Standard

Practical examples

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

inline-size live example

CSS

.reset-example {
  inline-size: initial;
}

.inherit-example {
  inline-size: inherit;
}

@supports (inline-size: initial) {
  .supported {
    inline-size: initial;
  }
}