wffweb/src/main/java/com/webfirmframework/wffweb/css/ListStyleImage.java
public static boolean isValid(final String cssValue) {
        String trimmedCssValue = null;
        if (cssValue == null) {
            return false;
        } else if ((trimmedCssValue = StringUtil.strip(cssValue))
                .equalsIgnoreCase(INITIAL)
                || trimmedCssValue.equalsIgnoreCase(INHERIT)
                || trimmedCssValue.equalsIgnoreCase(NONE)) {
            return true;
        } else if (trimmedCssValue.toLowerCase().startsWith("url(")
                && trimmedCssValue.endsWith(")")) {
            return true;
        }
        return false;
    }
public static boolean isValid(final String cssValue) {
        String trimmedCssValue = null;
        if (cssValue == null) {
            return false;
        } else if ((trimmedCssValue = StringUtil.strip(cssValue))
                .equalsIgnoreCase(INITIAL)
                || trimmedCssValue.equalsIgnoreCase(INHERIT)
                || trimmedCssValue.equalsIgnoreCase(NONE)) {
            return true;
        } else if (trimmedCssValue.toLowerCase().startsWith("url(")
                && trimmedCssValue.endsWith(")")) {
            return true;
        }
        return false;
    }
To check whether the given {@code cssValue} is valid for this class.

@param cssValue
@return true if the given {@code cssValue} is valid for this class.
@since 1.0.0
@author WFF