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• 句法
• 形式定义
• 形式句法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

border-bottom-left-radius 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.

The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

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 background-clip 特性。

句法

/* 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;
border-bottom-left-radius: inherit;
					

With one value:

• the value is a <length> 或 <percentage> denoting the radius of the circle to use for the border in that corner.

With two values:

• the first value is a <length> 或 <percentage> denoting the horizontal semi-major axis of the ellipse to use for the border in that corner.
• the second value is a <length> 或 <percentage> denoting the vertical semi-major axis of the ellipse to use for the border in that corner.

值

<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 <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.

形式定义

形式句法

<length-percentage>{1,2}
where 
<length-percentage> = <length> | <percentage>
					

范例

Examples of different border-bottom-left-radius values

div {
  border-bottom-left-radius: 40px 40px;
}
										

div {
  border-bottom-left-radius: 40px 20px;
}
											

div {
  border-bottom-left-radius: 40%;
}
												

div {
  border-bottom-left-radius: 40%;
}
													

div {
  border-bottom-left-radius:40%;
  border-style: black 3px double;
  background-color: rgb(250,20,70);
  background-clip: content-box;
}
														

规范

浏览器兼容性

图例

完整支持

完整支持

见实现注意事项。

见实现注意事项。

用户必须明确启用此特征。

用户必须明确启用此特征。

使用非标名称。

使用非标名称。

要求使用供应商前缀或不同名称。

要求使用供应商前缀或不同名称。

另请参阅

• border-radius shorthand property
• border-top-right-radius , border-bottom-right-radius ，和 border-top-left-radius

• 最后修改： Oct 15, 2020

相关话题

1. CSS
2. CSS 参考
3. CSS Backgrounds and Borders
4. 指南

   1. Resizing background images with background-size
   2. Using multiple backgrounds
5. 特性

   1. background
   2. background-attachment
   3. background-clip
   4. background-color
   5. background-image
   6. background-origin
   7. background-position
   8. background-position-x
   9. background-position-y
   10. background-repeat
   11. background-size
   12. border
   13. border-bottom
   14. border-bottom-color
   15. border-bottom-left-radius
   16. border-bottom-right-radius
   17. border-bottom-style
   18. border-bottom-width
   19. border-color
   20. border-image
   21. border-image-outset
   22. border-image-repeat
   23. border-image-slice
   24. border-image-source
   25. border-image-width
   26. border-left
   27. border-left-color
   28. border-left-style
   29. border-left-width
   30. border-radius
   31. border-right
   32. border-right-color
   33. border-right-style
   34. border-right-width
   35. border-style
   36. border-top
   37. border-top-color
   38. border-top-left-radius
   39. border-top-right-radius
   40. border-top-style
   41. border-top-width
   42. border-width
   43. box-shadow