CSS contain-intrinsic-inline-size Property Reference

The CSS contain-intrinsic-inline-size property is a standard property in CSS Box Sizing. Review its formal syntax, computed behavior, and practical declarations.

Updated 2026-08-12

contain-intrinsic-inline-size overview

The CSS contain-intrinsic-inline-size property is a standard property in CSS Box Sizing. 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

contain-intrinsic-inline-size formal syntax

Field	Value
Formal syntax	auto? [ none \| <length> ]
Initial value	none
Applies to	elementsForWhichSizeContainmentCanApply
Inherited	No
Percentages	no
Computed value	asSpecifiedWithLengthValuesComputed
Animation type	byComputedValueType
Media	Not specified
Specification group	CSS Box Sizing
Status	Standard

Practical examples

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

contain-intrinsic-inline-size live example

CSS

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

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

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