CSS interpolate-size Property Reference

The CSS interpolate-size property is a experimental property in CSS Values and Units. Review its formal syntax, computed behavior, and practical declarations.

Updated 2026-08-12

interpolate-size overview

The CSS interpolate-size property is a experimental property in CSS Values and Units. Review its formal syntax, computed behavior, and practical declarations.

The computed value normally inherits from the parent element when no declaration wins the cascade.

Syntax and formal definition

interpolate-size formal syntax

Field	Value
Formal syntax	numeric-only \| allow-keywords
Initial value	numeric-only
Applies to	allElements
Inherited	Yes
Percentages	no
Computed value	asSpecified
Animation type	notAnimatable
Media	none
Specification group	CSS Values and Units
Status	Experimental

Practical examples

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

interpolate-size live example

CSS

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

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

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