public function register_controls() {

		/* Themes (controls are loaded via ajax) */

		$this->add_panel(
			new WP_Customize_Themes_Panel(
				$this,
				'themes',
				array(
					'title'       => $this->theme()->display( 'Name' ),
					'description' => (
					'<p>' . __( 'Looking for a theme? You can search or browse the WordPress.org theme directory, install and preview themes, then activate them right here.' ) . '</p>' .
					'<p>' . __( 'While previewing a new theme, you can continue to tailor things like widgets and menus, and explore theme-specific options.' ) . '</p>'
					),
					'capability'  => 'switch_themes',
					'priority'    => 0,
				)
			)
		);

		$this->add_section(
			new WP_Customize_Themes_Section(
				$this,
				'installed_themes',
				array(
					'title'      => __( 'Installed themes' ),
					'action'     => 'installed',
					'capability' => 'switch_themes',
					'panel'      => 'themes',
					'priority'   => 0,
				)
			)
		);

		if ( ! is_multisite() ) {
			$this->add_section(
				new WP_Customize_Themes_Section(
					$this,
					'wporg_themes',
					array(
						'title'       => __( 'WordPress.org themes' ),
						'action'      => 'wporg',
						'filter_type' => 'remote',
						'capability'  => 'install_themes',
						'panel'       => 'themes',
						'priority'    => 5,
					)
				)
			);
		}

		// Themes Setting (unused - the theme is considerably more fundamental to the Customizer experience).
		$this->add_setting(
			new WP_Customize_Filter_Setting(
				$this,
				'active_theme',
				array(
					'capability' => 'switch_themes',
				)
			)
		);

		/* Site Identity */

		$this->add_section(
			'title_tagline',
			array(
				'title'    => __( 'Site Identity' ),
				'priority' => 20,
			)
		);

		$this->add_setting(
			'blogname',
			array(
				'default'    => get_option( 'blogname' ),
				'type'       => 'option',
				'capability' => 'manage_options',
			)
		);

		$this->add_control(
			'blogname',
			array(
				'label'   => __( 'Site Title' ),
				'section' => 'title_tagline',
			)
		);

		$this->add_setting(
			'blogdescription',
			array(
				'default'    => get_option( 'blogdescription' ),
				'type'       => 'option',
				'capability' => 'manage_options',
			)
		);

		$this->add_control(
			'blogdescription',
			array(
				'label'   => __( 'Tagline' ),
				'section' => 'title_tagline',
			)
		);

		// Add a setting to hide header text if the theme doesn't support custom headers.
		if ( ! current_theme_supports( 'custom-header', 'header-text' ) ) {
			$this->add_setting(
				'header_text',
				array(
					'theme_supports'    => array( 'custom-logo', 'header-text' ),
					'default'           => 1,
					'sanitize_callback' => 'absint',
				)
			);

			$this->add_control(
				'header_text',
				array(
					'label'    => __( 'Display Site Title and Tagline' ),
					'section'  => 'title_tagline',
					'settings' => 'header_text',
					'type'     => 'checkbox',
				)
			);
		}

		$this->add_setting(
			'site_icon',
			array(
				'type'       => 'option',
				'capability' => 'manage_options',
				'transport'  => 'postMessage', // Previewed with JS in the Customizer controls window.
			)
		);

		$this->add_control(
			new WP_Customize_Site_Icon_Control(
				$this,
				'site_icon',
				array(
					'label'       => __( 'Site Icon' ),
					'description' => sprintf(
						'<p>' . __( 'Site Icons are what you see in browser tabs, bookmark bars, and within the WordPress mobile apps. Upload one here!' ) . '</p>' .
						/* translators: %s: Site icon size in pixels. */
						'<p>' . __( 'Site Icons should be square and at least %s pixels.' ) . '</p>',
						'<strong>512 &times; 512</strong>'
					),
					'section'     => 'title_tagline',
					'priority'    => 60,
					'height'      => 512,
					'width'       => 512,
				)
			)
		);

		$this->add_setting(
			'custom_logo',
			array(
				'theme_supports' => array( 'custom-logo' ),
				'transport'      => 'postMessage',
			)
		);

		$custom_logo_args = get_theme_support( 'custom-logo' );
		$this->add_control(
			new WP_Customize_Cropped_Image_Control(
				$this,
				'custom_logo',
				array(
					'label'         => __( 'Logo' ),
					'section'       => 'title_tagline',
					'priority'      => 8,
					'height'        => isset( $custom_logo_args[0]['height'] ) ? $custom_logo_args[0]['height'] : null,
					'width'         => isset( $custom_logo_args[0]['width'] ) ? $custom_logo_args[0]['width'] : null,
					'flex_height'   => isset( $custom_logo_args[0]['flex-height'] ) ? $custom_logo_args[0]['flex-height'] : null,
					'flex_width'    => isset( $custom_logo_args[0]['flex-width'] ) ? $custom_logo_args[0]['flex-width'] : null,
					'button_labels' => array(
						'select'       => __( 'Select logo' ),
						'change'       => __( 'Change logo' ),
						'remove'       => __( 'Remove' ),
						'default'      => __( 'Default' ),
						'placeholder'  => __( 'No logo selected' ),
						'frame_title'  => __( 'Select logo' ),
						'frame_button' => __( 'Choose logo' ),
					),
				)
			)
		);

		$this->selective_refresh->add_partial(
			'custom_logo',
			array(
				'settings'            => array( 'custom_logo' ),
				'selector'            => '.custom-logo-link',
				'render_callback'     => array( $this, '_render_custom_logo_partial' ),
				'container_inclusive' => true,
			)
		);

		/* Colors */

		$this->add_section(
			'colors',
			array(
				'title'    => __( 'Colors' ),
				'priority' => 40,
			)
		);

		$this->add_setting(
			'header_textcolor',
			array(
				'theme_supports'       => array( 'custom-header', 'header-text' ),
				'default'              => get_theme_support( 'custom-header', 'default-text-color' ),

				'sanitize_callback'    => array( $this, '_sanitize_header_textcolor' ),
				'sanitize_js_callback' => 'maybe_hash_hex_color',
			)
		);

		// Input type: checkbox
		// With custom value
		$this->add_control(
			'display_header_text',
			array(
				'settings' => 'header_textcolor',
				'label'    => __( 'Display Site Title and Tagline' ),
				'section'  => 'title_tagline',
				'type'     => 'checkbox',
				'priority' => 40,
			)
		);

		$this->add_control(
			new WP_Customize_Color_Control(
				$this,
				'header_textcolor',
				array(
					'label'   => __( 'Header Text Color' ),
					'section' => 'colors',
				)
			)
		);

		// Input type: Color
		// With sanitize_callback
		$this->add_setting(
			'background_color',
			array(
				'default'              => get_theme_support( 'custom-background', 'default-color' ),
				'theme_supports'       => 'custom-background',

				'sanitize_callback'    => 'sanitize_hex_color_no_hash',
				'sanitize_js_callback' => 'maybe_hash_hex_color',
			)
		);

		$this->add_control(
			new WP_Customize_Color_Control(
				$this,
				'background_color',
				array(
					'label'   => __( 'Background Color' ),
					'section' => 'colors',
				)
			)
		);

		/* Custom Header */

		if ( current_theme_supports( 'custom-header', 'video' ) ) {
			$title       = __( 'Header Media' );
			$description = '<p>' . __( 'If you add a video, the image will be used as a fallback while the video loads.' ) . '</p>';

			$width  = absint( get_theme_support( 'custom-header', 'width' ) );
			$height = absint( get_theme_support( 'custom-header', 'height' ) );
			if ( $width && $height ) {
				$control_description = sprintf(
					/* translators: 1: .mp4, 2: Header size in pixels. */
					__( 'Upload your video in %1$s format and minimize its file size for best results. Your theme recommends dimensions of %2$s pixels.' ),
					'<code>.mp4</code>',
					sprintf( '<strong>%s &times; %s</strong>', $width, $height )
				);
			} elseif ( $width ) {
				$control_description = sprintf(
					/* translators: 1: .mp4, 2: Header width in pixels. */
					__( 'Upload your video in %1$s format and minimize its file size for best results. Your theme recommends a width of %2$s pixels.' ),
					'<code>.mp4</code>',
					sprintf( '<strong>%s</strong>', $width )
				);
			} else {
				$control_description = sprintf(
					/* translators: 1: .mp4, 2: Header height in pixels. */
					__( 'Upload your video in %1$s format and minimize its file size for best results. Your theme recommends a height of %2$s pixels.' ),
					'<code>.mp4</code>',
					sprintf( '<strong>%s</strong>', $height )
				);
			}
		} else {
			$title               = __( 'Header Image' );
			$description         = '';
			$control_description = '';
		}

		$this->add_section(
			'header_image',
			array(
				'title'          => $title,
				'description'    => $description,
				'theme_supports' => 'custom-header',
				'priority'       => 60,
			)
		);

		$this->add_setting(
			'header_video',
			array(
				'theme_supports'    => array( 'custom-header', 'video' ),
				'transport'         => 'postMessage',
				'sanitize_callback' => 'absint',
				'validate_callback' => array( $this, '_validate_header_video' ),
			)
		);

		$this->add_setting(
			'external_header_video',
			array(
				'theme_supports'    => array( 'custom-header', 'video' ),
				'transport'         => 'postMessage',
				'sanitize_callback' => array( $this, '_sanitize_external_header_video' ),
				'validate_callback' => array( $this, '_validate_external_header_video' ),
			)
		);

		$this->add_setting(
			new WP_Customize_Filter_Setting(
				$this,
				'header_image',
				array(
					'default'        => sprintf( get_theme_support( 'custom-header', 'default-image' ), get_template_directory_uri(), get_stylesheet_directory_uri() ),
					'theme_supports' => 'custom-header',
				)
			)
		);

		$this->add_setting(
			new WP_Customize_Header_Image_Setting(
				$this,
				'header_image_data',
				array(
					'theme_supports' => 'custom-header',
				)
			)
		);

		/*
		 * Switch image settings to postMessage when video support is enabled since
		 * it entails that the_custom_header_markup() will be used, and thus selective
		 * refresh can be utilized.
		 */
		if ( current_theme_supports( 'custom-header', 'video' ) ) {
			$this->get_setting( 'header_image' )->transport      = 'postMessage';
			$this->get_setting( 'header_image_data' )->transport = 'postMessage';
		}

		$this->add_control(
			new WP_Customize_Media_Control(
				$this,
				'header_video',
				array(
					'theme_supports'  => array( 'custom-header', 'video' ),
					'label'           => __( 'Header Video' ),
					'description'     => $control_description,
					'section'         => 'header_image',
					'mime_type'       => 'video',
					'active_callback' => 'is_header_video_active',
				)
			)
		);

		$this->add_control(
			'external_header_video',
			array(
				'theme_supports'  => array( 'custom-header', 'video' ),
				'type'            => 'url',
				'description'     => __( 'Or, enter a YouTube URL:' ),
				'section'         => 'header_image',
				'active_callback' => 'is_header_video_active',
			)
		);

		$this->add_control( new WP_Customize_Header_Image_Control( $this ) );

		$this->selective_refresh->add_partial(
			'custom_header',
			array(
				'selector'            => '#wp-custom-header',
				'render_callback'     => 'the_custom_header_markup',
				'settings'            => array( 'header_video', 'external_header_video', 'header_image' ), // The image is used as a video fallback here.
				'container_inclusive' => true,
			)
		);

		/* Custom Background */

		$this->add_section(
			'background_image',
			array(
				'title'          => __( 'Background Image' ),
				'theme_supports' => 'custom-background',
				'priority'       => 80,
			)
		);

		$this->add_setting(
			'background_image',
			array(
				'default'           => get_theme_support( 'custom-background', 'default-image' ),
				'theme_supports'    => 'custom-background',
				'sanitize_callback' => array( $this, '_sanitize_background_setting' ),
			)
		);

		$this->add_setting(
			new WP_Customize_Background_Image_Setting(
				$this,
				'background_image_thumb',
				array(
					'theme_supports'    => 'custom-background',
					'sanitize_callback' => array( $this, '_sanitize_background_setting' ),
				)
			)
		);

		$this->add_control( new WP_Customize_Background_Image_Control( $this ) );

		$this->add_setting(
			'background_preset',
			array(
				'default'           => get_theme_support( 'custom-background', 'default-preset' ),
				'theme_supports'    => 'custom-background',
				'sanitize_callback' => array( $this, '_sanitize_background_setting' ),
			)
		);

		$this->add_control(
			'background_preset',
			array(
				'label'   => _x( 'Preset', 'Background Preset' ),
				'section' => 'background_image',
				'type'    => 'select',
				'choices' => array(
					'default' => _x( 'Default', 'Default Preset' ),
					'fill'    => __( 'Fill Screen' ),
					'fit'     => __( 'Fit to Screen' ),
					'repeat'  => _x( 'Repeat', 'Repeat Image' ),
					'custom'  => _x( 'Custom', 'Custom Preset' ),
				),
			)
		);

		$this->add_setting(
			'background_position_x',
			array(
				'default'           => get_theme_support( 'custom-background', 'default-position-x' ),
				'theme_supports'    => 'custom-background',
				'sanitize_callback' => array( $this, '_sanitize_background_setting' ),
			)
		);

		$this->add_setting(
			'background_position_y',
			array(
				'default'           => get_theme_support( 'custom-background', 'default-position-y' ),
				'theme_supports'    => 'custom-background',
				'sanitize_callback' => array( $this, '_sanitize_background_setting' ),
			)
		);

		$this->add_control(
			new WP_Customize_Background_Position_Control(
				$this,
				'background_position',
				array(
					'label'    => __( 'Image Position' ),
					'section'  => 'background_image',
					'settings' => array(
						'x' => 'background_position_x',
						'y' => 'background_position_y',
					),
				)
			)
		);

		$this->add_setting(
			'background_size',
			array(
				'default'           => get_theme_support( 'custom-background', 'default-size' ),
				'theme_supports'    => 'custom-background',
				'sanitize_callback' => array( $this, '_sanitize_background_setting' ),
			)
		);

		$this->add_control(
			'background_size',
			array(
				'label'   => __( 'Image Size' ),
				'section' => 'background_image',
				'type'    => 'select',
				'choices' => array(
					'auto'    => _x( 'Original', 'Original Size' ),
					'contain' => __( 'Fit to Screen' ),
					'cover'   => __( 'Fill Screen' ),
				),
			)
		);

		$this->add_setting(
			'background_repeat',
			array(
				'default'           => get_theme_support( 'custom-background', 'default-repeat' ),
				'sanitize_callback' => array( $this, '_sanitize_background_setting' ),
				'theme_supports'    => 'custom-background',
			)
		);

		$this->add_control(
			'background_repeat',
			array(
				'label'   => __( 'Repeat Background Image' ),
				'section' => 'background_image',
				'type'    => 'checkbox',
			)
		);

		$this->add_setting(
			'background_attachment',
			array(
				'default'           => get_theme_support( 'custom-background', 'default-attachment' ),
				'sanitize_callback' => array( $this, '_sanitize_background_setting' ),
				'theme_supports'    => 'custom-background',
			)
		);

		$this->add_control(
			'background_attachment',
			array(
				'label'   => __( 'Scroll with Page' ),
				'section' => 'background_image',
				'type'    => 'checkbox',
			)
		);

		// If the theme is using the default background callback, we can update
		// the background CSS using postMessage.
		if ( get_theme_support( 'custom-background', 'wp-head-callback' ) === '_custom_background_cb' ) {
			foreach ( array( 'color', 'image', 'preset', 'position_x', 'position_y', 'size', 'repeat', 'attachment' ) as $prop ) {
				$this->get_setting( 'background_' . $prop )->transport = 'postMessage';
			}
		}

		/*
		 * Static Front Page
		 * See also https://core.trac.wordpress.org/ticket/19627 which introduces the static-front-page theme_support.
		 * The following replicates behavior from options-reading.php.
		 */

		$this->add_section(
			'static_front_page',
			array(
				'title'           => __( 'Homepage Settings' ),
				'priority'        => 120,
				'description'     => __( 'You can choose what&#8217;s displayed on the homepage of your site. It can be posts in reverse chronological order (classic blog), or a fixed/static page. To set a static homepage, you first need to create two Pages. One will become the homepage, and the other will be where your posts are displayed.' ),
				'active_callback' => array( $this, 'has_published_pages' ),
			)
		);

		$this->add_setting(
			'show_on_front',
			array(
				'default'    => get_option( 'show_on_front' ),
				'capability' => 'manage_options',
				'type'       => 'option',
			)
		);

		$this->add_control(
			'show_on_front',
			array(
				'label'   => __( 'Your homepage displays' ),
				'section' => 'static_front_page',
				'type'    => 'radio',
				'choices' => array(
					'posts' => __( 'Your latest posts' ),
					'page'  => __( 'A static page' ),
				),
			)
		);

		$this->add_setting(
			'page_on_front',
			array(
				'type'       => 'option',
				'capability' => 'manage_options',
			)
		);

		$this->add_control(
			'page_on_front',
			array(
				'label'          => __( 'Homepage' ),
				'section'        => 'static_front_page',
				'type'           => 'dropdown-pages',
				'allow_addition' => true,
			)
		);

		$this->add_setting(
			'page_for_posts',
			array(
				'type'       => 'option',
				'capability' => 'manage_options',
			)
		);

		$this->add_control(
			'page_for_posts',
			array(
				'label'          => __( 'Posts page' ),
				'section'        => 'static_front_page',
				'type'           => 'dropdown-pages',
				'allow_addition' => true,
			)
		);

		/* Custom CSS */
		$section_description  = '<p>';
		$section_description .= __( 'Add your own CSS code here to customize the appearance and layout of your site.' );
		$section_description .= sprintf(
			' <a href="%1$s" class="external-link" target="_blank">%2$s<span class="screen-reader-text"> %3$s</span></a>',
			esc_url( __( 'https://codex.wordpress.org/CSS' ) ),
			__( 'Learn more about CSS' ),
			/* translators: Accessibility text. */
			__( '(opens in a new tab)' )
		);
		$section_description .= '</p>';

		$section_description .= '<p id="editor-keyboard-trap-help-1">' . __( 'When using a keyboard to navigate:' ) . '</p>';
		$section_description .= '<ul>';
		$section_description .= '<li id="editor-keyboard-trap-help-2">' . __( 'In the editing area, the Tab key enters a tab character.' ) . '</li>';
		$section_description .= '<li id="editor-keyboard-trap-help-3">' . __( 'To move away from this area, press the Esc key followed by the Tab key.' ) . '</li>';
		$section_description .= '<li id="editor-keyboard-trap-help-4">' . __( 'Screen reader users: when in forms mode, you may need to press the Esc key twice.' ) . '</li>';
		$section_description .= '</ul>';

		if ( 'false' !== wp_get_current_user()->syntax_highlighting ) {
			$section_description .= '<p>';
			$section_description .= sprintf(
				/* translators: 1: Link to user profile, 2: Additional link attributes, 3: Accessibility text. */
				__( 'The edit field automatically highlights code syntax. You can disable this in your <a href="%1$s" %2$s>user profile%3$s</a> to work in plain text mode.' ),
				esc_url( get_edit_profile_url() ),
				'class="external-link" target="_blank"',
				sprintf(
					'<span class="screen-reader-text"> %s</span>',
					/* translators: Accessibility text. */
					__( '(opens in a new tab)' )
				)
			);
			$section_description .= '</p>';
		}

		$section_description .= '<p class="section-description-buttons">';
		$section_description .= '<button type="button" class="button-link section-description-close">' . __( 'Close' ) . '</button>';
		$section_description .= '</p>';

		$this->add_section(
			'custom_css',
			array(
				'title'              => __( 'Additional CSS' ),
				'priority'           => 200,
				'description_hidden' => true,
				'description'        => $section_description,
			)
		);

		$custom_css_setting = new WP_Customize_Custom_CSS_Setting(
			$this,
			sprintf( 'custom_css[%s]', get_stylesheet() ),
			array(
				'capability' => 'edit_css',
				'default'    => '',
			)
		);
		$this->add_setting( $custom_css_setting );

		$this->add_control(
			new WP_Customize_Code_Editor_Control(
				$this,
				'custom_css',
				array(
					'label'       => __( 'CSS code' ),
					'section'     => 'custom_css',
					'settings'    => array( 'default' => $custom_css_setting->id ),
					'code_type'   => 'text/css',
					'input_attrs' => array(
						'aria-describedby' => 'editor-keyboard-trap-help-1 editor-keyboard-trap-help-2 editor-keyboard-trap-help-3 editor-keyboard-trap-help-4',
					),
				)
			)
		);
	}