///
/// Generates cross-browser-compatible `border-radius` for a given element.
///
/// @author drublic
///
/// @link http://caniuse.com/border-radius caniuse
/// @link http://www.w3.org/TR/css3-background/#corners spec
///
/// @param {List} $values
///
/// @output
/// ```css
///   -webkit-border-radius: <values>;
///           border-radius: <values>;
/// ```
///
/// @example
///   .selector {
///     @include x-border-radius(20px 10px);
///   }
///
@mixin x-border-radius ($values) {
	-webkit-border-radius: $values; // iOS Safari 3.2, Android 2.1
	        border-radius: $values;
}