wp-includes/admin-bar.php:1155Adds appearance submenu items to the "Site Name" menu.
$wp_admin_barWP_Admin_Barfunction wp_admin_bar_appearance_menu( $wp_admin_bar ) { $wp_admin_bar->add_group( array( 'parent' => 'site-name', 'id' => 'appearance', ) ); if ( current_user_can( 'switch_themes' ) ) { $wp_admin_bar->add_node( array( 'parent' => 'appearance', 'id' => 'themes', 'title' => __( 'Themes' ), 'href' => admin_url( 'themes.php' ), ) ); } if ( ! current_user_can( 'edit_theme_options' ) ) { return; } if ( current_theme_supports( 'widgets' ) ) { $wp_admin_bar->add_node( array( 'parent' => 'appearance', 'id' => 'widgets', 'title' => __( 'Widgets' ), 'href' => admin_url( 'widgets.php' ), ) ); } if ( current_theme_supports( 'menus' ) || current_theme_supports( 'widgets' ) ) { $wp_admin_bar->add_node( array( 'parent' => 'appearance', 'id' => 'menus', 'title' => __( 'Menus' ), 'href' => admin_url( 'nav-menus.php' ), ) ); } if ( current_theme_supports( 'custom-background' ) ) { $wp_admin_bar->add_node( array( 'parent' => 'appearance', 'id' => 'background', 'title' => _x( 'Background', 'custom background' ), 'href' => admin_url( 'themes.php?page=custom-background' ), 'meta' => array( 'class' => 'hide-if-customize', ), ) ); } if ( current_theme_supports( 'custom-header' ) ) { $wp_admin_bar->add_node( array( 'parent' => 'appearance', 'id' => 'header', 'title' => _x( 'Header', 'custom image header' ), 'href' => admin_url( 'themes.php?page=custom-header' ), 'meta' => array( 'class' => 'hide-if-customize', ), ) ); }}Introduced in 3.1.0. Unchanged from 6.7.7 through 7.1.0.
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src/wp-includes/admin-bar.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.