CSS text-decoration-thickness Property Reference

The CSS text-decoration-thickness property is a standard property in CSS Text Decoration. Review its formal syntax, computed behavior, and practical declarations.

Updated 2026-08-12

text-decoration-thickness overview

The CSS text-decoration-thickness property is a standard property in CSS Text Decoration. 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

text-decoration-thickness formal syntax

Field	Value
Formal syntax	auto \| from-font \| <length> \| <percentage>
Initial value	auto
Applies to	allElements
Inherited	No
Percentages	referToElementFontSize
Computed value	asSpecified
Animation type	byComputedValueType
Media	visual
Specification group	CSS Text Decoration
Status	Standard

Practical examples

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

text-decoration-thickness live example

CSS

.reset-example {
  text-decoration-thickness: initial;
}

.inherit-example {
  text-decoration-thickness: inherit;
}

@supports (text-decoration-thickness: initial) {
  .supported {
    text-decoration-thickness: initial;
  }
}