wffweb/src/main/java/com/webfirmframework/wffweb/tag/html/attribute/global/Style.java
public boolean markAsImportant(final String styleName) {
        if (styleName == null) {
            return false;
        }
        final long stamp = lock.writeLock();
        try {

            final String trimmedStyleName = StringUtil.strip(styleName);
            final String value = super.getAttributeValueMap()
                    .get(trimmedStyleName);
            if (value != null && !value.isEmpty()) {
                return super.addToAttributeValueMap(trimmedStyleName,
                        value + " " + IMPORTANT);
            }
            return false;
        } finally {
            lock.unlockWrite(stamp);
        }
    }
public boolean markAsImportant(final String styleName) {
        if (styleName == null) {
            return false;
        }
        final long stamp = lock.writeLock();
        try {

            final String trimmedStyleName = StringUtil.strip(styleName);
            final String value = super.getAttributeValueMap()
                    .get(trimmedStyleName);
            if (value != null && !value.isEmpty()) {
                return super.addToAttributeValueMap(trimmedStyleName,
                        value + " " + IMPORTANT);
            }
            return false;
        } finally {
            lock.unlockWrite(stamp);
        }
    }
marks as important. i.e. it will add {@code !important} from the
corresponding styleName value

@param styleName
@return true if it's marked as important or false if it already marked as
important
@since 1.0.0
@author WFF