border-top-right-radius

Defines the curve of the physical top-right corner. It can take one or two values to create circular or elliptical curves.

It is documented as part of the CSS Backgrounds and Borders specification.

/* Usage Example */
.pill-tab {
  /* Rounds the top-right corner */
  border-top-right-radius: 12px;
  background: #f8fafc;
  border: 1px solid #e2e8f0;
}

/* Syntax */
border-top-right-radius: length-percentage;

/* Global values */
border-top-right-radius: inherit;
border-top-right-radius: initial;
border-top-right-radius: revert;
border-top-right-radius: revert-layer;
border-top-right-radius: unset;
Widely available Since 2015 96% global usage

This feature is well established and works across many devices and browser versions. It has been available across browsers since 2015.

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