border-bottom-left-radius

Specifically rounds the bottom-left corner of an element. This is useful for creating unique shapes like speech bubbles or tabbed interfaces where only certain corners should be rounded.

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

/* Usage Example */
.speech-bubble {
  border-bottom-left-radius: 0;
  border-top-left-radius: 20px;
  border-top-right-radius: 20px;
  border-bottom-right-radius: 20px;
}

/* Syntax */
border-bottom-left-radius: length-percentage;

/* Global values */
border-bottom-left-radius: inherit;
border-bottom-left-radius: initial;
border-bottom-left-radius: revert;
border-bottom-left-radius: revert-layer;
border-bottom-left-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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