/// <summary>
        ///   <para>Annotation to display next to the button.</para>
        /// </summary>
        /// <param name="widget">Widget to call method on.</param>
        /// <param name="annotation">Annotation for the button.</param>
        /// <returns>Reference to provided <paramref name="widget"/>.</returns>
        /// <exception cref="ArgumentNullException">If <paramref name="widget"/> is a <c>null</c> reference.</exception>
        /// <seealso cref="IGooglePlusOneButtonWidget.Annotation(string)"/>
        public static IGooglePlusOneButtonWidget Annotation(this IGooglePlusOneButtonWidget widget, GooglePlusOneButtonAnnotation annotation)
        {
            Assertion.NotNull(widget);

            return(widget.Annotation(annotation.ToString().ToLowerInvariant()));
        }
        /// <summary>
        ///   <para>Size of the button.</para>
        /// </summary>
        /// <param name="widget">Widget to call method on.</param>
        /// <param name="size">Size of the button.</param>
        /// <returns>Reference to provided <paramref name="widget"/>.</returns>
        /// <exception cref="ArgumentNullException">If <paramref name="widget"/> is a <c>null</c> reference.</exception>
        /// <seealso cref="IGooglePlusOneButtonWidget.Size(string)"/>
        public static IGooglePlusOneButtonWidget Size(this IGooglePlusOneButtonWidget widget, GooglePlusOneButtonSize size)
        {
            Assertion.NotNull(widget);

            return(widget.Size(size.ToString().ToLowerInvariant()));
        }
        /// <summary>
        ///   <para>Horizontal alignment of the button assets within its frame.</para>
        /// </summary>
        /// <param name="widget">Widget to call method on.</param>
        /// <param name="alignment">Horizontal alignment of the button.</param>
        /// <returns>Reference to provided <paramref name="widget"/>.</returns>
        /// <exception cref="ArgumentNullException">If <paramref name="widget"/> is a <c>null</c> reference.</exception>
        /// <seealso cref="IGooglePlusOneButtonWidget.Alignment(string)"/>
        public static IGooglePlusOneButtonWidget Alignment(this IGooglePlusOneButtonWidget widget, GooglePlusOneButtonAlignment alignment)
        {
            Assertion.NotNull(widget);

            return(widget.Alignment(alignment.ToString().ToLowerInvariant()));
        }
        /// <summary>
        ///   <para>If annotation is set to "inline", this parameter sets the width in pixels to use for the button and its inline annotation.</para>
        /// </summary>
        /// <param name="widget">Widget to call method on.</param>
        /// <param name="width">Width of the button.</param>
        /// <returns>Reference to provided <paramref name="widget"/>.</returns>
        /// <exception cref="ArgumentNullException">If <paramref name="widget"/> is a <c>null</c> reference.</exception>
        /// <seealso cref="IGooglePlusOneButtonWidget.Width(string)"/>
        public static IGooglePlusOneButtonWidget Width(this IGooglePlusOneButtonWidget widget, short width)
        {
            Assertion.NotNull(widget);

            return(widget.Width(width.ToString(CultureInfo.InvariantCulture)));
        }