}
                }
            }


			$selectors = array(
							'container'					=> ".avia-timeline-container .av-milestone.{$element_id}",
							'milestone-icon'			=> ".avia-timeline-container .av-milestone.{$element_id} .x-av-milestone-icon",
							'milestone-icon-inner'		=> ".avia-timeline-container .av-milestone.{$element_id} .av-milestone-icon-inner",
							'milestone-indicator'		=> ".avia-timeline-container .av-milestone.{$element_id} .av-milestone-indicator",
							'milestone-article-footer'	=> ".avia-timeline-container .av-milestone.{$element_id} .av-milestone-article-footer"

					);

			$element_styling->add_selectors( $selectors );

			$result['default'] = $default;
			$result['atts'] = $atts;
			$result['content'] = $content;
			$result['element_styling'] = $element_styling;

			return $result;
		}


        /**
         * Frontend Shortcode Handler
         *
         * @param array $atts array of attributes
         * @param string $content text within enclosing form of shortcode element
         * @param string $shortcodename the shortcode found, when == callback name
         * @return string $output returns the modified html string
         */
        function shortcode_handler( $atts, $content = '', $shortcodename = '', $meta = '' )
        {
			$result = $this->get_element_styles( compact( array( 'atts', 'content', 'shortcodename', 'meta' ) ) );

			extract( $result );

			extract( $this->screen_options );	// return $av_font_classes, $av_title_font_classes and $av_display_classes

			extract( $atts );

			$this->parent_atts = $atts;


			avia_sc_timeline::$timeline_count ++;

            $slider_attribute = 'horizontal' == $orientation ? "avia-data-slides='{$slides_num}'" : '';
			$id = ! empty( $meta['custom_el_id'] ) ? $meta['custom_el_id'] : ' id="avia-timeline-' . avia_sc_timeline::$timeline_count . '" ';

			$this->milestone_count = 0;
			$timeline_items_html = ShortcodeHelper::avia_remove_autop( $content, true );


			$style_tag = $element_styling->get_style_tag( $element_id );
			$item_tag = $element_styling->style_tag_html( $this->subitem_inline_styles, 'sub-' . $element_id );
			$container_class = $element_styling->get_class_string( 'container' );
			$item_container_class = $element_styling->get_class_string( 'item_container_class' );

            $output  = '';
			$output .= $style_tag;
			$output .= $item_tag;
            $output .=	"<div {$id} class='{$container_class} {$av_display_classes}' {$slider_attribute}>";
            $output .=		"<ul class='{$item_container_class}'>";
            $output .=			$timeline_items_html;
            $output .=		'</ul>';


            if( 'horizontal' == $orientation )
			{
				$args = array(
							'class_main'	=> "av-timeline-nav {$av_display_classes}",
							'class_prev'	=> 'av-timeline-nav-prev av-nav-btn',
							'class_next'	=> 'av-timeline-nav-next av-nav-btn'
						);

				$output .= aviaFrontTemplates::slide_navigation_arrows( $args );
            }

            $output .= '</div>';

            return $output;
        }

		/**
		 *
		 * @param array $atts
		 * @param string $content
		 * @param string $shortcodename
		 * @return string
		 */
        public function av_timeline_item( $atts, $content = '', $shortcodename = '' )
        {
			/**
			 * Fixes a problem when 3-rd party plugins call nested shortcodes without executing main shortcode  (like YOAST in wpseo-filter-shortcodes)
			 */
			if( empty( $this->screen_options ) )
			{
				return '';
			}


			$result = $this->get_element_styles_item( compact( array( 'atts', 'content', 'shortcodename' ) ) );

			extract( $result );
			extract( $atts );
            extract( $this->screen_options ); //return $av_font_classes, $av_title_font_classes and $av_display_classes


            $linktitle = '';
            $linktarget = '';
            $link = '';

            if( ! empty( $atts['link'] ) )
			{
                $atts['link'] = AviaHelper::get_url( $atts['link'] );
				$linktarget = AviaHelper::get_link_target( $atts['linktarget'] );
                $linktitle = $atts['title'];
            }


			$list_class = $this->milestone_count % 2 == 0 ? 'av-milestone-odd' : 'av-milestone-even';
			$customid = ! empty( $atts['custom_id'] ) ? 'id="' . AviaHelper::save_string( $atts['custom_id'], '-', '', 'id' ) . '"' : '';


			$this->subitem_inline_styles .= $element_styling->get_style_tag( $element_id, 'rules_only' );
			$container_class = $element_styling->get_class_string( 'container' );
			$milestone_icon_class = $element_styling->get_class_string( 'milestone-icon' );
			$milestone_icon_inner_class = $element_styling->get_class_string( 'milestone-icon-inner' );


			/**
			 * Icon / image
			 */
            $icon_wrapper = array();
            if( in_array( $atts['linkelement'], array( 'all', 'both', 'icon_head', 'icon_only' ) ) &&  ! empty( $atts['link'] ) )
			{
                $icon_wrapper['start'] = "<a class='av-milestone-icon-wrap' title='" . esc_attr( $linktitle ) . "' href='{$atts['link']}' {$linktarget}>";
                $icon_wrapper['end'] = '</a>';
            }
			else
			{
				 $icon_wrapper['start'] = '<div class="av-milestone-icon-wrap">';
				 $icon_wrapper['end'] = '</div>';
			}

            $icon = $icon_wrapper['start'];

            if( $atts['icon_image'] == 'image' )
			{
                $icon .= "<span class='{$milestone_icon_class}'>";
                $icon .=	"<span class='{$milestone_icon_inner_class}'>&nbsp;</span>";
                $icon .= '</span>';
            }
			else if( $atts['icon_image'] == 'icon' )
			{
				$display_char = av_icon( $atts['icon'], $atts['font'] );

                $icon .= "<span class='{$milestone_icon_class} avia-font-{$atts['font']}'>";
                $icon .=	"<span class='{$milestone_icon_inner_class}'>";
				$icon .=		"<i class='milestone-char' {$display_char}></i>";
				$icon .=	'</span>';
                $icon .= '</span>';
            }
			else if( $atts['icon_image'] == 'number' )
			{
                $num = $this->milestone_count + 1;

                if( $atts['number_arrow'] == 'arrow' )
				{
                    $milestone_icon_class .= ' milestone_bullet_arrow';
                }

                $icon .= "<span class='{$milestone_icon_class}'>";
                $icon .=	"<span class='{$milestone_icon_inner_class}'>";
				$icon .=		"<span class='milestone_number'>{$num}</span>";
				 $icon .=	'</span>';
                $icon .= '</span>';
            }

            $icon .= $icon_wrapper['end'];

			/**
			 * Date
			 */
			$default_heading = 'h2';
			$args = array(
						'heading'		=> $default_heading,
						'extra_class'	=> ''
					);

			$extra_args = array( $this, $atts, $content, 'date' );

			/**
			 * @since 4.5.5
			 * @return array
			 */
			$args = apply_filters( 'avf_customize_heading_settings', $args, __CLASS__, $extra_args );

			$heading = ! empty( $args['heading'] ) ? $args['heading'] : $default_heading;
			$css = ! empty( $args['extra_class'] ) ? $args['extra_class'] : '';

            $title_sanitized = sanitize_title( $atts['date'] );
            $date_wrapper = array();

            if( in_array( $atts['linkelement'], array( 'all', 'both', 'date_head' ) ) && ! empty( $atts['link'] ) )
			{
                $date_wrapper['start'] = "<{$heading} class='av-milestone-date {$css} {$av_title_font_classes}' id='milestone-{$title_sanitized}'><a title='" . esc_attr($linktitle) . "' href='{$atts['link']}' {$linktarget}>";
                $date_wrapper['end'] = "</a></{$heading}>";
            }
			else
			{
				$date_wrapper['start'] = "<{$heading} class='av-milestone-date {$css} {$av_title_font_classes}' id='milestone-{$title_sanitized}'><strong>";
				$date_wrapper['end'] = "</strong></{$heading}>";
			}

            $date  = '';
            $date .= $date_wrapper['start'];
            $date .=	$atts['date'];
            $date .=	"<span class='av-milestone-indicator'></span>";
            $date .= $date_wrapper['end'];


			/**
			 * Article / Content
			 */
            $article = '';
            $article .= "<article class='av-milestone-content-wrap'>";
            $article .=		"<div class='av-milestone-contentbox'>";
            if( ! empty( $atts['title'] ) )
			{
				$default_heading = 'h4';
				$args = array(
							'heading'		=> $default_heading,
							'extra_class'	=> ''
						);

				$extra_args = array( $this, $atts, $content, 'title' );

				/**
				 * @since 4.5.5
				 * @return array
				 */
				$args = apply_filters( 'avf_customize_heading_settings', $args, __CLASS__, $extra_args );

				$heading = ! empty( $args['heading'] ) ? $args['heading'] : $default_heading;
				$css = ! empty( $args['extra_class'] ) ? $args['extra_class'] : '';

				$title_class = "class='av-milestone-title {$av_font_classes} {$css}'";
                $headline_wrap = array();

                if( in_array( $atts['linkelement'], array( 'all', 'icon_head', 'date_head' ) ) &&  ! empty( $atts['link'] ) )
				{
                    $headline_wrap['start'] = "<{$heading} {$title_class}><a title='" . esc_attr($linktitle) . "' href='{$atts['link']}' {$linktarget}>";
                    $headline_wrap['end'] = "</a></{$heading}>";
                }
				else
				{
					$headline_wrap['start'] = "<{$heading} {$title_class}>";
					$headline_wrap['end'] = "</{$heading}>";
				}

                $article .= '<header class="entry-content-header">';
                $article .=		$headline_wrap['start'];
                $article .=			$atts['title'];
                $article .=		$headline_wrap['end'];
                $article .= '</header>';
            }

            $article .=			"<div class='av-milestone-content {$av_font_classes}'>";
            $article .=				ShortcodeHelper::avia_apply_autop( ShortcodeHelper::avia_remove_autop( $content ) );
            $article .=			'</div>';
            $article .=		'</div>';
            $article .=		"<footer class='av-milestone-article-footer entry-footer'></footer>";
            $article .=	'</article>';


			$output  = '';
            $output .= "<li {$customid} class='{$container_class} {$list_class}'>";

            switch ( $this->parent_atts['placement'] )
			{
                case 'av-milestone-placement-left':
                    $output .= $date;
                    $output .= $icon;
                    $output .= $article;
                    break;

                case 'av-milestone-placement-right':
                    $output .= $date;
                    $output .= $article;
                    $output .= $icon;
                    $output .= $date;
                    break;

                case 'av-milestone-placement-alternate':
                    if( $this->milestone_count % 2 == 0 )
					{
                        $output .= $date;
                        $output .= $icon;
                        $output .= $article;
                    }
					else
					{
                        if( 'vertical' == $this->parent_atts['orientation'] )
						{
                            $output .= $date;
                        }

                        $output .= $article;
                        $output .= $icon;
                        $output .= $date;
                    }
                    break;

                case 'av-milestone-placement-top':
                    $output .= $date;
                    $output .= $icon;
                    $output .= $article;
                    break;

                case 'av-milestone-placement-bottom':
                    $output .= $article;
                    $output .= $icon;
                    $output .= $date;
                    break;

            }

            $output .= '</li>';

            $this->milestone_count++;

            return $output;
        }

    }
}