Property Reference - CSS Reference - page 149

Name
border-top-left-radius
Values:
[ <length> | <percentage> ] [ <length> | <percentage> ]?
Initial value:
0
Applies to:
All elements
Inherited:
No
Percentages:
Refer to the dimensions of the element's border box
Computed value:
Same as declared value
Description:
Defines the rounding radius for the top-left corner of an element's border. If two values are
supplied, the first is the horizontal radius and the second is the vertical radius. See border-
radius for a description of how the values create the rounding shape.
Examples:
h1 {border-top-left-radius: 10%;}
h2 {border-top-left-radius: 1em 10px;}