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---
title: border-bottom-left-radius
slug: Web/CSS/border-bottom-left-radius
page-type: css-property
browser-compat: css.properties.border-bottom-left-radius
---
{{CSSRef}}
The **`border-bottom-left-radius`** [CSS](/en-US/docs/Web/CSS) property rounds the bottom-left corner of an element by specifying the radius (or the radius of the semi-major and semi-minor axes) of the ellipse defining the curvature of the corner.
{{EmbedInteractiveExample("pages/css/border-bottom-left-radius.html")}}
The rounding can be a circle or an ellipse, or if one of the value is `0` no rounding is done and the corner is square.
A background, being an image or a color, is clipped at the border, even a rounded one; the exact location of the clipping is defined by the value of the {{cssxref("background-clip")}} property.
> **Note:** If the value of this property is not set in a {{cssxref("border-radius")}} shorthand property that is applied to the element after the `border-bottom-left-radius` CSS property, the value of this property is then reset to its initial value by the [shorthand property](/en-US/docs/Web/CSS/Shorthand_properties).
## Syntax
```css
/* the corner is a circle */
/* border-bottom-left-radius: radius */
border-bottom-left-radius: 3px;
/* Percentage values */
/* circle if box is a square or ellipse if box is a rectangle */
border-bottom-left-radius: 20%;
/* same as above: 20% of horizontal(width) and vertical(height) */
border-bottom-left-radius: 20% 20%;
/* 20% of horizontal(width) and 10% of vertical(height) */
border-bottom-left-radius: 20% 10%;
/* the corner is an ellipse */
/* border-bottom-left-radius: horizontal vertical */
border-bottom-left-radius: 0.5em 1em;
/* 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;
```
With one value:
- the value is a {{cssxref("<length>")}} or a {{cssxref("<percentage>")}} denoting the radius of the circle to use for the border in that corner.
With two values:
- the first value is a {{cssxref("<length>")}} or a {{cssxref("<percentage>")}} denoting the horizontal semi-major axis of the ellipse to use for the border in that corner.
- the second value is a {{cssxref("<length>")}} or a {{cssxref("<percentage>")}} denoting the vertical semi-major axis of the ellipse to use for the border in that corner.
### Values
- `<length-percentage>`
- : Denotes the size of the circle radius or the semi-major and semi-minor axes of the ellipse. As absolute length it can be expressed in any unit allowed by the CSS {{cssxref("<length>")}} data type. Percentages for the horizontal axis refer to the width of the box, percentages for the vertical axis refer to the height of the box. Negative values are invalid.
## Formal definition
{{CSSInfo}}
## Formal syntax
{{csssyntax}}
## Examples
### Arc of a circle
A single `<length>` value produces an arc of a circle.
```html hidden
<div></div>
```
```css
div {
border-bottom-left-radius: 40px;
background-color: lightgreen;
border: solid 1px black;
width: 100px;
height: 100px;
}
```
{{EmbedLiveSample("Arc_of_a_circle")}}
### Arc of an ellipse
Two different `<length>` values produce an arc of an ellipse.
```html hidden
<div></div>
```
```css
div {
border-bottom-left-radius: 40px 20px;
background-color: lightgreen;
border: solid 1px black;
width: 100px;
height: 100px;
}
```
{{EmbedLiveSample("Arc_of_an_ellipse")}}
### Square element with percentage radius
A square element with a single `<percentage>` value produces an arc of a circle.
```html hidden
<div></div>
```
```css
div {
border-bottom-left-radius: 40%;
background-color: lightgreen;
border: solid 1px black;
width: 100px;
height: 100px;
}
```
{{EmbedLiveSample("Square_element_with_percentage_radius")}}
### Non-square element with percentage radius
A non-square element with a single `<percentage>` value produces an arc of an ellipse.
```html hidden
<div></div>
```
```css
div {
border-bottom-left-radius: 40%;
background-color: lightgreen;
border: solid 1px black;
width: 200px;
height: 100px;
}
```
{{EmbedLiveSample("Non-square_element_with_percentage_radius")}}
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{cssxref("border-radius")}} shorthand property
- {{cssxref("border-top-right-radius")}}, {{cssxref("border-bottom-right-radius")}}, and {{cssxref("border-top-left-radius")}}