diff -r 3d4e9c994f10 -r a86126ab1dd4 wp/wp-includes/class-wp-admin-bar.php
--- a/wp/wp-includes/class-wp-admin-bar.php	Tue Oct 22 16:11:46 2019 +0200
+++ b/wp/wp-includes/class-wp-admin-bar.php	Tue Dec 15 13:49:49 2020 +0100
@@ -82,14 +82,22 @@
 	}
 
 	/**
-	 * @param array $node
+	 * Add a node (menu item) to the Admin Bar menu.
+	 *
+	 * @since 3.3.0
+	 *
+	 * @param array $node The attributes that define the node.
 	 */
 	public function add_menu( $node ) {
 		$this->add_node( $node );
 	}
 
 	/**
-	 * @param string $id
+	 * Remove a node from the admin bar.
+	 *
+	 * @since 3.1.0
+	 *
+	 * @param string $id The menu slug to remove.
 	 */
 	public function remove_menu( $id ) {
 		$this->remove_node( $id );
@@ -114,9 +122,9 @@
 	 * }
 	 */
 	public function add_node( $args ) {
-		// Shim for old method signature: add_node( $parent_id, $menu_obj, $args )
-		if ( func_num_args() >= 3 && is_string( func_get_arg( 0 ) ) ) {
-			$args = array_merge( array( 'parent' => func_get_arg( 0 ) ), func_get_arg( 2 ) );
+		// Shim for old method signature: add_node( $parent_id, $menu_obj, $args ).
+		if ( func_num_args() >= 3 && is_string( $args ) ) {
+			$args = array_merge( array( 'parent' => $args ), func_get_arg( 2 ) );
 		}
 
 		if ( is_object( $args ) ) {
@@ -144,7 +152,8 @@
 		);
 
 		// If the node already exists, keep any data that isn't provided.
-		if ( $maybe_defaults = $this->get_node( $args['id'] ) ) {
+		$maybe_defaults = $this->get_node( $args['id'] );
+		if ( $maybe_defaults ) {
 			$defaults = get_object_vars( $maybe_defaults );
 		}
 
@@ -180,10 +189,11 @@
 	 * Gets a node.
 	 *
 	 * @param string $id
-	 * @return object Node.
+	 * @return object|void Node.
 	 */
 	final public function get_node( $id ) {
-		if ( $node = $this->_get_node( $id ) ) {
+		$node = $this->_get_node( $id );
+		if ( $node ) {
 			return clone $node;
 		}
 	}
@@ -210,7 +220,8 @@
 	 * @return array|void
 	 */
 	final public function get_nodes() {
-		if ( ! $nodes = $this->_get_nodes() ) {
+		$nodes = $this->_get_nodes();
+		if ( ! $nodes ) {
 			return;
 		}
 
@@ -307,19 +318,20 @@
 		}
 
 		foreach ( $this->_get_nodes() as $node ) {
-			if ( 'root' == $node->id ) {
+			if ( 'root' === $node->id ) {
 				continue;
 			}
 
 			// Fetch the parent node. If it isn't registered, ignore the node.
-			if ( ! $parent = $this->_get_node( $node->parent ) ) {
+			$parent = $this->_get_node( $node->parent );
+			if ( ! $parent ) {
 				continue;
 			}
 
 			// Generate the group class (we distinguish between top level and other level groups).
-			$group_class = ( $node->parent == 'root' ) ? 'ab-top-menu' : 'ab-submenu';
+			$group_class = ( 'root' === $node->parent ) ? 'ab-top-menu' : 'ab-submenu';
 
-			if ( $node->type == 'group' ) {
+			if ( 'group' === $node->type ) {
 				if ( empty( $node->meta['class'] ) ) {
 					$node->meta['class'] = $group_class;
 				} else {
@@ -328,7 +340,7 @@
 			}
 
 			// Items in items aren't allowed. Wrap nested items in 'default' groups.
-			if ( $parent->type == 'item' && $node->type == 'item' ) {
+			if ( 'item' === $parent->type && 'item' === $node->type ) {
 				$default_id = $parent->id . '-default';
 				$default    = $this->_get_node( $default_id );
 
@@ -357,7 +369,7 @@
 
 				// Groups in groups aren't allowed. Add a special 'container' node.
 				// The container will invisibly wrap both groups.
-			} elseif ( $parent->type == 'group' && $node->type == 'group' ) {
+			} elseif ( 'group' === $parent->type && 'group' === $node->type ) {
 				$container_id = $parent->id . '-container';
 				$container    = $this->_get_node( $container_id );
 
@@ -386,7 +398,7 @@
 						$container->parent = $grandparent->id;
 
 						$index = array_search( $parent, $grandparent->children, true );
-						if ( $index === false ) {
+						if ( false === $index ) {
 							$grandparent->children[] = $container;
 						} else {
 							array_splice( $grandparent->children, $index, 1, array( $container ) );
@@ -412,24 +424,13 @@
 	}
 
 	/**
-	 * @global bool $is_IE
 	 * @param object $root
 	 */
 	final protected function _render( $root ) {
-		global $is_IE;
-
 		// Add browser classes.
 		// We have to do this here since admin bar shows on the front end.
 		$class = 'nojq nojs';
-		if ( $is_IE ) {
-			if ( strpos( $_SERVER['HTTP_USER_AGENT'], 'MSIE 7' ) ) {
-				$class .= ' ie7';
-			} elseif ( strpos( $_SERVER['HTTP_USER_AGENT'], 'MSIE 8' ) ) {
-				$class .= ' ie8';
-			} elseif ( strpos( $_SERVER['HTTP_USER_AGENT'], 'MSIE 9' ) ) {
-				$class .= ' ie9';
-			}
-		} elseif ( wp_is_mobile() ) {
+		if ( wp_is_mobile() ) {
 			$class .= ' mobile';
 		}
 
@@ -457,7 +458,7 @@
 	 * @param object $node
 	 */
 	final protected function _render_container( $node ) {
-		if ( $node->type != 'container' || empty( $node->children ) ) {
+		if ( 'container' !== $node->type || empty( $node->children ) ) {
 			return;
 		}
 
@@ -472,11 +473,11 @@
 	 * @param object $node
 	 */
 	final protected function _render_group( $node ) {
-		if ( $node->type == 'container' ) {
+		if ( 'container' === $node->type ) {
 			$this->_render_container( $node );
 			return;
 		}
-		if ( $node->type != 'group' || empty( $node->children ) ) {
+		if ( 'group' !== $node->type || empty( $node->children ) ) {
 			return;
 		}
 
@@ -497,7 +498,7 @@
 	 * @param object $node
 	 */
 	final protected function _render_item( $node ) {
-		if ( $node->type != 'item' ) {
+		if ( 'item' !== $node->type ) {
 			return;
 		}
 
@@ -536,16 +537,19 @@
 		if ( $has_link ) {
 			$attributes = array( 'onclick', 'target', 'title', 'rel', 'lang', 'dir' );
 			echo "<a class='ab-item'$aria_attributes href='" . esc_url( $node->href ) . "'";
-			if ( ! empty( $node->meta['onclick'] ) ) {
-				echo ' onclick="' . esc_js( $node->meta['onclick'] ) . '"';
-			}
 		} else {
 			$attributes = array( 'onclick', 'target', 'title', 'rel', 'lang', 'dir' );
 			echo '<div class="ab-item ab-empty-item"' . $aria_attributes;
 		}
 
 		foreach ( $attributes as $attribute ) {
-			if ( ! empty( $node->meta[ $attribute ] ) ) {
+			if ( empty( $node->meta[ $attribute ] ) ) {
+				continue;
+			}
+
+			if ( 'onclick' === $attribute ) {
+				echo " $attribute='" . esc_js( $node->meta[ $attribute ] ) . "'";
+			} else {
 				echo " $attribute='" . esc_attr( $node->meta[ $attribute ] ) . "'";
 			}
 		}
@@ -592,13 +596,13 @@
 	/**
 	 */
 	public function add_menus() {
-		// User related, aligned right.
+		// User-related, aligned right.
 		add_action( 'admin_bar_menu', 'wp_admin_bar_my_account_menu', 0 );
 		add_action( 'admin_bar_menu', 'wp_admin_bar_search_menu', 4 );
 		add_action( 'admin_bar_menu', 'wp_admin_bar_my_account_item', 7 );
 		add_action( 'admin_bar_menu', 'wp_admin_bar_recovery_mode_menu', 8 );
 
-		// Site related.
+		// Site-related.
 		add_action( 'admin_bar_menu', 'wp_admin_bar_sidebar_toggle', 0 );
 		add_action( 'admin_bar_menu', 'wp_admin_bar_wp_menu', 10 );
 		add_action( 'admin_bar_menu', 'wp_admin_bar_my_sites_menu', 20 );
@@ -606,7 +610,7 @@
 		add_action( 'admin_bar_menu', 'wp_admin_bar_customize_menu', 40 );
 		add_action( 'admin_bar_menu', 'wp_admin_bar_updates_menu', 50 );
 
-		// Content related.
+		// Content-related.
 		if ( ! is_network_admin() && ! is_user_admin() ) {
 			add_action( 'admin_bar_menu', 'wp_admin_bar_comments_menu', 60 );
 			add_action( 'admin_bar_menu', 'wp_admin_bar_new_content_menu', 70 );