CSS isolation Property Reference

The CSS isolation property is a standard property in Compositing and Blending. Review its formal syntax, computed behavior, and practical declarations.

Updated 2026-08-12

isolation overview

The CSS isolation property is a standard property in Compositing and Blending. 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

isolation formal syntax

Field	Value
Formal syntax	auto \| isolate
Initial value	auto
Applies to	allElementsSVGContainerGraphicsAndGraphicsReferencingElements
Inherited	No
Percentages	no
Computed value	asSpecified
Animation type	notAnimatable
Media	visual
Specification group	Compositing and Blending
Status	Standard

Practical examples

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

isolation live example

CSS

.reset-example {
  isolation: initial;
}

.inherit-example {
  isolation: inherit;
}

@supports (isolation: initial) {
  .supported {
    isolation: initial;
  }
}