CSS corner-start-start-shape Property Reference

The CSS corner-start-start-shape property is a standard property in CSS Backgrounds and Borders. Review its formal syntax, computed behavior, and practical declarations.

Updated 2026-08-12

corner-start-start-shape overview

The CSS corner-start-start-shape property is a standard property in CSS Backgrounds and Borders. 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

corner-start-start-shape formal syntax

Field	Value
Formal syntax	<corner-shape-value>
Initial value	round
Applies to	allElements
Inherited	No
Percentages	no
Computed value	correspondingSuperellipse
Animation type	superellipseInterpolation
Media	visual
Specification group	CSS Backgrounds and Borders
Status	Standard

Practical examples

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

corner-start-start-shape live example

CSS

.reset-example {
  corner-start-start-shape: initial;
}

.inherit-example {
  corner-start-start-shape: inherit;
}

@supports (corner-start-start-shape: initial) {
  .supported {
    corner-start-start-shape: initial;
  }
}