Initial commit. State 04.2021.

wp-content/themes/twentyfifteen/js/customize-preview.js

@@ -0,0 +1,35 @@
+/**
+ * Live-update changed settings in real time in the Customizer preview.
+ */
+
+( function( $ ) {
+	var $style = $( '#twentyfifteen-color-scheme-css' ),
+		api = wp.customize;
+
+	if ( ! $style.length ) {
+		$style = $( 'head' ).append( '<style type="text/css" id="twentyfifteen-color-scheme-css" />' )
+		                    .find( '#twentyfifteen-color-scheme-css' );
+	}
+
+	// Site title.
+	api( 'blogname', function( value ) {
+		value.bind( function( to ) {
+			$( '.site-title a' ).text( to );
+		} );
+	} );
+
+	// Site tagline.
+	api( 'blogdescription', function( value ) {
+		value.bind( function( to ) {
+			$( '.site-description' ).text( to );
+		} );
+	} );
+
+	// Color Scheme CSS.
+	api.bind( 'preview-ready', function() {
+		api.preview.bind( 'update-color-scheme-css', function( css ) {
+			$style.html( css );
+		} );
+	} );
+
+} )( jQuery );