border-start-end-radius

The logical way to round the corner where the 'start' of the block (top) meets the 'end' of the inline dimension (right in LTR). It adapts to writing mode changes automatically.

It is documented as part of the CSS Logical Properties and Values specification.

/* Usage Example */
.logical-card {
  /* Rounds the logical top-right corner */
  border-start-end-radius: 20px;
  background: #fff;
}

/* Syntax */
border-start-end-radius: border-top-left-radius;

/* Global values */
border-start-end-radius: inherit;
border-start-end-radius: initial;
border-start-end-radius: revert;
border-start-end-radius: revert-layer;
border-start-end-radius: unset;
Widely available Since 2021 95% global usage

This feature is well established and works across many devices and browser versions. It has been available across browsers since 2021.

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