WordPress/wp-content/themes/twentythirteen/js/theme-customizer.js

/**
 * Customizer enhancements for a better user experience.
 *
 * Contains handlers to make Customizer preview reload changes asynchronously.
 * Things like site title and description changes.
 */

( function( $ ) {
	// Site title and description.
	wp.customize( 'blogname', function( value ) {
		value.bind( function( to ) {
			$( '.site-title' ).text( to );
		} );
	} );
	wp.customize( 'blogdescription', function( value ) {
		value.bind( function( to ) {
			$( '.site-description' ).text( to );
		} );
	} );
	// Header text color.
	wp.customize( 'header_textcolor', function( value ) {
		value.bind( function( to ) {
			if ( 'blank' == to ) {
				if ( 'remove-header' == wp.customize.instance( 'header_image' ).get() ) {
					$( '.home-link' ).css( 'min-height', '0' );
				}
				$( '.site-title, .site-description' ).css( {
					'clip': 'rect(1px, 1px, 1px, 1px)',
					'position': 'absolute'
				} );
			} else {
				$( '.home-link' ).css( 'min-height', '230px' );
				$( '.site-title, .site-description' ).css( {
					'clip': 'auto',
					'color': to,
					'position': 'relative'
				} );
			}
		} );
	} );

	if ( wp.customize.selectiveRefresh ) {
		wp.customize.selectiveRefresh.bind( 'sidebar-updated', function( sidebarPartial ) {
			var widgetArea;
			if ( 'sidebar-1' === sidebarPartial.sidebarId && $.isFunction( $.fn.masonry ) ) {
				widgetArea = $( '#secondary .widget-area' );
				widgetArea.masonry( 'destroy' );
				widgetArea.masonry();
			}
		} );
	}

} )( jQuery );