Initial commit. State 04.2021.

wp-content/themes/twentyfourteen/js/keyboard-image-navigation.js

@@ -0,0 +1,21 @@
+/**
+ * Twenty Fourteen keyboard support for image navigation.
+ */
+( function( $ ) {
+	$( document ).on( 'keydown.twentyfourteen', function( e ) {
+		var url = false;
+
+		// Left arrow key code.
+		if ( e.which === 37 ) {
+			url = $( '.previous-image a' ).attr( 'href' );
+
+		// Right arrow key code.
+		} else if ( e.which === 39 ) {
+			url = $( '.entry-attachment a' ).attr( 'href' );
+		}
+
+		if ( url && ( ! $( 'textarea, input' ).is( ':focus' ) ) ) {
+			window.location = url;
+		}
+	} );
+} )( jQuery );