border-start-start-radius
Rounds the corner where the 'start' of the block (top) and the 'start' of the inline dimension (left in LTR) meet. This is the logical successor to 'border-top-left-radius'.
It is documented as part of the CSS Logical Properties and Values specification.
Syntax
/* Usage Example */
.modern-box {
/* Rounds the logical top-left corner */
border-start-start-radius: 15px;
padding: 1.5rem;
border: 2px solid #333;
}
/* Syntax */
border-start-start-radius: border-top-left-radius;
/* Global values */
border-start-start-radius: inherit;
border-start-start-radius: initial;
border-start-start-radius: revert;
border-start-start-radius: revert-layer;
border-start-start-radius: unset;border-start-start-radius Browser support
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.
89+
66+
15+
89+
Your first month is free
Managed WordPress hosting for faster sites.
Learn more