code: public static boolean isCSSURLRequiringQuotes (@Nonnull final String sURL)
    {
      ValueEnforcer.notNull (sURL, "URL");
  
      for (final char c : sURL.toCharArray ())
        if (!isValidCSSURLChar (c))
          return true;
      return false;
    }
docs: Check if any character inside the passed URL needs escaping.
  
  @param sURL
  The URL to be checked. May not be <code>null</code>.
  @return <code>true</code> if any of the contained characters needs
  escaping, <code>false</code> if the URL can be used as is.