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Summary

The border-bottom-right-radius CSS property sets the rounding of the bottom-right corner of the element. 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.

border-bottom-right-radius.png

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 background-clip property.

If the value of this property is not set in a border-radius shorthand property that is applied to the element after the border-bottom-right-radius CSS property, the value of this property is then reset to its initial value by the shorthand property.

Initial value0
Applies toall elements; but User Agents are not required to apply to table and inline-table elements when border-collapse is collapse. The behavior on internal table elements is undefined for the moment.. It also applies to ::first-letter.
Inheritedno
Percentagesrefer to the corresponding dimension of the border box
Mediavisual
Computed valuetwo absolute <length>s or <percentage>s
Animation typea length, percentage or calc();
Canonical orderthe unique non-ambiguous order defined by the formal grammar

Syntax

/* the corner is a circle */
/* border-bottom-right-radius: radius */
border-bottom-right-radius: 3px;

/* the corner is an ellipsis */
/* border-bottom-right-radius: horizontal vertical */
border-bottom-right-radius: 0.5em 1em;

border-bottom-right-radius: inherit;

where:

radius
Is a <length> or a <percentage> denoting the radius of the circle to use for the border in that corner.
horizontal
Is a <length> or a <percentage> denoting the horizontal semi-major axis of the ellipsis to use for the border in that corner.
vertical
Is a <length> or a <percentage> denoting the vertical semi-major axis of the ellipsis 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 ellipsis. As absolute length it can be expressed in any unit allowed by the CSS <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 syntax

<length-percentage>{1,2}

where
<length-percentage> = <length> | <percentage>

Examples

Live example Code
.
An arc of circle is used as the border
div {
  border-bottom-right-radius: 40px 40px;
}
.
An arc of ellipse is used as the border
div {
  border-bottom-right-radius: 40px 20px;
}
.
The box is a square: an arc of circle is used as the border
div {
  border-bottom-right-radius: 40%;
}
.
The box is not a square: an arc of ellipse is used as the border
div {
  border-bottom-right-radius: 40%;
}
.
The background color is clipped at the border
div {
  border-bottom-right-radius:40%;
  border-style: black 3px double;
  background-color: rgb(250,20,70);
  background-clip: content-box;
}

Specifications

Specification Status Comment
CSS Backgrounds and Borders Module Level 3
The definition of 'border-bottom-right-radius' in that specification.
Candidate Recommendation Initial definition

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 1.0 -webkit
4.0
1.0 (1.0)-moz[1]
4.0 (2.0)[3]
9.0 10.5 3.0 (522)-webkit
5.0 (532.5)
Percentages 4.0 1.0 (1.0)[2]
4.0 (2.0)
9.0 10.5 5.0 (532.5)
Elliptical corners 1.0 3.5 (1.9.1) 9.0 10.5 3.0 (522)
Feature Android Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile
Basic support ? (Yes)[3] ? ? ?
Percentages ? (Yes) ? ? ?
Elliptical corners ? (Yes) ? ? ?

[1] The prefixed version (allowed from Firefox 1 to Firefox 12) of this property uses a different name, -moz-border-radius-bottomright.

[2] Before Firefox 4, the <percentage> was relative to the width of the box even when specifying the radius for a height). This implied that -moz-border-radius-bottomright was always drawing an arc of circle, and never an ellipse, when followed by a single value.

[3] Prior to Gecko 50.0 (Firefox 50.0 / Thunderbird 50.0 / SeaMonkey 2.47), border styles of rounded corners were always rendered as if border-style was solid. This has been fixed in Gecko 50.0.

In addition to the unprefixed support, Gecko 44.0 (Firefox 44.0 / Thunderbird 44.0 / SeaMonkey 2.41) added support for a -webkit prefixed version of the property for web compatibility reasons behind the preference layout.css.prefixes.webkit, defaulting to false. Since Gecko 49.0 (Firefox 49.0 / Thunderbird 49.0 / SeaMonkey 2.46) the preference defaults to true.

See also

The border-radius-related CSS properties: the CSS shorthand border-radius, the properties for the other corners: border-top-right-radius, border-top-left-radius, and border-bottom-left-radius.

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