Border-top-left-radius

The CSS   property was introduced in CSS3. This property is currently only supported in Gecko 2.0 (Firefox 4.0), Opera 10.5, and WebKit 532.5 (Safari 5 and Chrome 5). It sets the border radius of the top left corner of an object. To specify an individual border radius for another specific corner of an object, use the,  , and/or   properties.

Values
HTML example:

CSS example: