diff -r 490d5cc509ed -r cf61fcea0001 wp/wp-content/themes/twentyseventeen/inc/icon-functions.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-content/themes/twentyseventeen/inc/icon-functions.php	Mon Oct 14 17:39:30 2019 +0200
@@ -0,0 +1,220 @@
+<?php
+/**
+ * SVG icons related functions and filters
+ *
+ * @package WordPress
+ * @subpackage Twenty_Seventeen
+ * @since 1.0
+ */
+
+/**
+ * Add SVG definitions to the footer.
+ */
+function twentyseventeen_include_svg_icons() {
+	// Define SVG sprite file.
+	$svg_icons = get_parent_theme_file_path( '/assets/images/svg-icons.svg' );
+
+	// If it exists, include it.
+	if ( file_exists( $svg_icons ) ) {
+		require_once( $svg_icons );
+	}
+}
+add_action( 'wp_footer', 'twentyseventeen_include_svg_icons', 9999 );
+
+/**
+ * Return SVG markup.
+ *
+ * @param array $args {
+ *     Parameters needed to display an SVG.
+ *
+ *     @type string $icon  Required SVG icon filename.
+ *     @type string $title Optional SVG title.
+ *     @type string $desc  Optional SVG description.
+ * }
+ * @return string SVG markup.
+ */
+function twentyseventeen_get_svg( $args = array() ) {
+	// Make sure $args are an array.
+	if ( empty( $args ) ) {
+		return __( 'Please define default parameters in the form of an array.', 'twentyseventeen' );
+	}
+
+	// Define an icon.
+	if ( false === array_key_exists( 'icon', $args ) ) {
+		return __( 'Please define an SVG icon filename.', 'twentyseventeen' );
+	}
+
+	// Set defaults.
+	$defaults = array(
+		'icon'        => '',
+		'title'       => '',
+		'desc'        => '',
+		'fallback'    => false,
+	);
+
+	// Parse args.
+	$args = wp_parse_args( $args, $defaults );
+
+	// Set aria hidden.
+	$aria_hidden = ' aria-hidden="true"';
+
+	// Set ARIA.
+	$aria_labelledby = '';
+
+	/*
+	 * Twenty Seventeen doesn't use the SVG title or description attributes; non-decorative icons are described with .screen-reader-text.
+	 *
+	 * However, child themes can use the title and description to add information to non-decorative SVG icons to improve accessibility.
+	 *
+	 * Example 1 with title: <?php echo twentyseventeen_get_svg( array( 'icon' => 'arrow-right', 'title' => __( 'This is the title', 'textdomain' ) ) ); ?>
+	 *
+	 * Example 2 with title and description: <?php echo twentyseventeen_get_svg( array( 'icon' => 'arrow-right', 'title' => __( 'This is the title', 'textdomain' ), 'desc' => __( 'This is the description', 'textdomain' ) ) ); ?>
+	 *
+	 * See https://www.paciellogroup.com/blog/2013/12/using-aria-enhance-svg-accessibility/.
+	 */
+	if ( $args['title'] ) {
+		$aria_hidden     = '';
+		$unique_id       = uniqid();
+		$aria_labelledby = ' aria-labelledby="title-' . $unique_id . '"';
+
+		if ( $args['desc'] ) {
+			$aria_labelledby = ' aria-labelledby="title-' . $unique_id . ' desc-' . $unique_id . '"';
+		}
+	}
+
+	// Begin SVG markup.
+	$svg = '<svg class="icon icon-' . esc_attr( $args['icon'] ) . '"' . $aria_hidden . $aria_labelledby . ' role="img">';
+
+	// Display the title.
+	if ( $args['title'] ) {
+		$svg .= '<title id="title-' . $unique_id . '">' . esc_html( $args['title'] ) . '</title>';
+
+		// Display the desc only if the title is already set.
+		if ( $args['desc'] ) {
+			$svg .= '<desc id="desc-' . $unique_id . '">' . esc_html( $args['desc'] ) . '</desc>';
+		}
+	}
+
+	/*
+	 * Display the icon.
+	 *
+	 * The whitespace around `<use>` is intentional - it is a work around to a keyboard navigation bug in Safari 10.
+	 *
+	 * See https://core.trac.wordpress.org/ticket/38387.
+	 */
+	$svg .= ' <use href="#icon-' . esc_html( $args['icon'] ) . '" xlink:href="#icon-' . esc_html( $args['icon'] ) . '"></use> ';
+
+	// Add some markup to use as a fallback for browsers that do not support SVGs.
+	if ( $args['fallback'] ) {
+		$svg .= '<span class="svg-fallback icon-' . esc_attr( $args['icon'] ) . '"></span>';
+	}
+
+	$svg .= '</svg>';
+
+	return $svg;
+}
+
+/**
+ * Display SVG icons in social links menu.
+ *
+ * @param  string  $item_output The menu item output.
+ * @param  WP_Post $item        Menu item object.
+ * @param  int     $depth       Depth of the menu.
+ * @param  array   $args        wp_nav_menu() arguments.
+ * @return string  $item_output The menu item output with social icon.
+ */
+function twentyseventeen_nav_menu_social_icons( $item_output, $item, $depth, $args ) {
+	// Get supported social icons.
+	$social_icons = twentyseventeen_social_links_icons();
+
+	// Change SVG icon inside social links menu if there is supported URL.
+	if ( 'social' === $args->theme_location ) {
+		foreach ( $social_icons as $attr => $value ) {
+			if ( false !== strpos( $item_output, $attr ) ) {
+				$item_output = str_replace( $args->link_after, '</span>' . twentyseventeen_get_svg( array( 'icon' => esc_attr( $value ) ) ), $item_output );
+			}
+		}
+	}
+
+	return $item_output;
+}
+add_filter( 'walker_nav_menu_start_el', 'twentyseventeen_nav_menu_social_icons', 10, 4 );
+
+/**
+ * Add dropdown icon if menu item has children.
+ *
+ * @param  string  $title The menu item's title.
+ * @param  WP_Post $item  The current menu item.
+ * @param  array   $args  An array of wp_nav_menu() arguments.
+ * @param  int     $depth Depth of menu item. Used for padding.
+ * @return string  $title The menu item's title with dropdown icon.
+ */
+function twentyseventeen_dropdown_icon_to_menu_link( $title, $item, $args, $depth ) {
+	if ( 'top' === $args->theme_location ) {
+		foreach ( $item->classes as $value ) {
+			if ( 'menu-item-has-children' === $value || 'page_item_has_children' === $value ) {
+				$title = $title . twentyseventeen_get_svg( array( 'icon' => 'angle-down' ) );
+			}
+		}
+	}
+
+	return $title;
+}
+add_filter( 'nav_menu_item_title', 'twentyseventeen_dropdown_icon_to_menu_link', 10, 4 );
+
+/**
+ * Returns an array of supported social links (URL and icon name).
+ *
+ * @return array $social_links_icons
+ */
+function twentyseventeen_social_links_icons() {
+	// Supported social links icons.
+	$social_links_icons = array(
+		'behance.net'     => 'behance',
+		'codepen.io'      => 'codepen',
+		'deviantart.com'  => 'deviantart',
+		'digg.com'        => 'digg',
+		'docker.com'      => 'dockerhub',
+		'dribbble.com'    => 'dribbble',
+		'dropbox.com'     => 'dropbox',
+		'facebook.com'    => 'facebook',
+		'flickr.com'      => 'flickr',
+		'foursquare.com'  => 'foursquare',
+		'plus.google.com' => 'google-plus',
+		'github.com'      => 'github',
+		'instagram.com'   => 'instagram',
+		'linkedin.com'    => 'linkedin',
+		'mailto:'         => 'envelope-o',
+		'medium.com'      => 'medium',
+		'pinterest.com'   => 'pinterest-p',
+		'pscp.tv'         => 'periscope',
+		'getpocket.com'   => 'get-pocket',
+		'reddit.com'      => 'reddit-alien',
+		'skype.com'       => 'skype',
+		'skype:'          => 'skype',
+		'slideshare.net'  => 'slideshare',
+		'snapchat.com'    => 'snapchat-ghost',
+		'soundcloud.com'  => 'soundcloud',
+		'spotify.com'     => 'spotify',
+		'stumbleupon.com' => 'stumbleupon',
+		'tumblr.com'      => 'tumblr',
+		'twitch.tv'       => 'twitch',
+		'twitter.com'     => 'twitter',
+		'vimeo.com'       => 'vimeo',
+		'vine.co'         => 'vine',
+		'vk.com'          => 'vk',
+		'wordpress.org'   => 'wordpress',
+		'wordpress.com'   => 'wordpress',
+		'yelp.com'        => 'yelp',
+		'youtube.com'     => 'youtube',
+	);
+
+	/**
+	 * Filter Twenty Seventeen social links icons.
+	 *
+	 * @since Twenty Seventeen 1.0
+	 *
+	 * @param array $social_links_icons Array of social links icons.
+	 */
+	return apply_filters( 'twentyseventeen_social_links_icons', $social_links_icons );
+}