/// <summary>
        ///   <para></para>
        /// </summary>
        /// <param name="widget"></param>
        /// <returns></returns>
        /// <exception cref="ArgumentNullException">If <paramref name="widget"/> is a <c>null</c> reference.</exception>
        public static IInlineImageWidget Gif(this IInlineImageWidget widget)
        {
            Assertion.NotNull(widget);

            return(widget.Format("gif"));
        }
        /// <summary>
        ///   <para></para>
        /// </summary>
        /// <param name="widget"></param>
        /// <returns></returns>
        /// <exception cref="ArgumentNullException">If <paramref name="widget"/> is a <c>null</c> reference.</exception>
        public static IInlineImageWidget Png(this IInlineImageWidget widget)
        {
            Assertion.NotNull(widget);

            return(widget.Format("png"));
        }