wffweb/src/main/java/com/webfirmframework/wffweb/css/css3/BorderImageSlice.java
public void addFill() {
        middle = FILL;
        cssValue = cssValue.replace(FILL, "").concat(" ").concat(FILL);
        if (getStateChangeInformer() != null) {
            getStateChangeInformer().stateChanged(this);
        }
    }
public void addFill() {
        middle = FILL;
        cssValue = cssValue.replace(FILL, "").concat(" ").concat(FILL);
        if (getStateChangeInformer() != null) {
            getStateChangeInformer().stateChanged(this);
        }
    }
adds the value {@code fill} in cssValue.

@since 1.0.0
@author WFF