CSS stroke-width Property Reference

The CSS stroke-width property is a standard property in Scalable Vector Graphics. Review its formal syntax, computed behavior, and practical declarations.

Updated 2026-08-12

stroke-width overview

The CSS stroke-width property is a standard property in Scalable Vector Graphics. 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

stroke-width formal syntax

Field	Value
Formal syntax	<length-percentage> \| <number>
Initial value	1px
Applies to	limitedSVGElementsShapes
Inherited	Yes
Percentages	referToSVGViewportDiagonal
Computed value	absoluteLengthOrPercentageNumbersConverted
Animation type	byComputedValueType
Media	visual
Specification group	Scalable Vector Graphics
Status	Standard

Practical examples

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

stroke-width live example

CSS

.reset-example {
  stroke-width: initial;
}

.inherit-example {
  stroke-width: inherit;
}

@supports (stroke-width: initial) {
  .supported {
    stroke-width: initial;
  }
}