CSS border-start-start-radius Property

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div {
  background-color: tomato;
  width: 150px;

.example1 {
  padding: 10px;
  background-color: red;
  border-start-start-radius: 50px;

.example2 {
  writing-mode: vertical-rl;
  padding: 10px;
  background-color: red;
  border-start-start-radius: 50px;

Hello World!


The border-start-start-radius CSS property specifies a logical border radius on an element, which maps to a physical border radius that depends on the element's writing-mode, direction, and text-orientation.

Default value:0
JavaScript syntax:

Standard Syntax

border-start-start-radius: length|percentage|initial|inherit|revert|revert-layer|unset;

Browser Support


Property Values

The following table describes the values of this property.

Value Description
length Specifies the length value in px, pt, cm, em, etc. Negative values are not allowed.
percentage The size of the radius in percentage. (In case of two values, the first value is horizontal radius and the second value is vertical radius.)
initial Sets this property to its default value.
inherit If specified, the associated element takes the computed value of its parent element animation-delay property.
revert Reverts the cascaded value of the property from its current value to the value the property
revert-layer Rollback styles to the ones specified in previous cascade layers.
unset Resets a property to its inherited value if the property naturally inherits from its parent, and to its initial value if not.

Default CSS Property Values

selectors {
  border-start-start-radius: 0;
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