/**
  * Add this property to the CssStyle
  *
  * @param style The CssStyle
  */
 public void addToStyle(ApplContext ac, CssStyle style) {
   CssBorder cssBorder = ((Css1Style) style).cssBorder;
   cssBorder.borderColor.byUser = byUser;
   if (cssBorder.borderColor.shorthand) {
     style.addRedefinitionWarning(ac, this);
   } else {
     top.addToStyle(ac, style);
     right.addToStyle(ac, style);
     bottom.addToStyle(ac, style);
     left.addToStyle(ac, style);
   }
   cssBorder.borderColor.shorthand = shorthand;
 }