CSS -moz-stack-sizing Property Reference

The CSS -moz-stack-sizing property is a nonstandard property in Mozilla Extensions. Review its formal syntax, computed behavior, and practical declarations.

Updated 2026-08-12

-moz-stack-sizing overview

The CSS -moz-stack-sizing property is a nonstandard property in Mozilla Extensions. 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

-moz-stack-sizing formal syntax

Field	Value
Formal syntax	ignore \| stretch-to-fit
Initial value	stretch-to-fit
Applies to	allElements
Inherited	Yes
Percentages	no
Computed value	asSpecified
Animation type	discrete
Media	visual
Specification group	Mozilla Extensions
Status	Nonstandard

Practical examples

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

-moz-stack-sizing live example

CSS

.reset-example {
  -moz-stack-sizing: initial;
}

.inherit-example {
  -moz-stack-sizing: inherit;
}

@supports (-moz-stack-sizing: initial) {
  .supported {
    -moz-stack-sizing: initial;
  }
}