wp_get_document_title

			/*
			 * If on the home page, set the logo alt attribute to an empty string,
			 * as the image is decorative and doesn't need its purpose to be described.
			 */
			$custom_logo_attr['alt'] = '';
		} else {
			/*
			 * If the logo alt attribute is empty, get the site title and explicitly pass it
			 * to the attributes used by wp_get_attachment_image().
			 */
			$image_alt = get_post_meta( $custom_logo_id, '_wp_attachment_image_alt', true );
			if ( empty( $image_alt ) ) {
				$custom_logo_attr['alt'] = get_bloginfo( 'name', 'display' );
			}
		}

		/**
		 * Filters the list of custom logo image attributes.
		 *
		 * @since 5.5.0
		 *
		 * @param array $custom_logo_attr Custom logo image attributes.
		 * @param int   $custom_logo_id   Custom logo attachment ID.
		 * @param int   $blog_id          ID of the blog to get the custom logo for.
		 */
		$custom_logo_attr = apply_filters( 'get_custom_logo_image_attributes', $custom_logo_attr, $custom_logo_id, $blog_id );

		/*
		 * If the alt attribute is not empty, there's no need to explicitly pass it
		 * because wp_get_attachment_image() already adds the alt attribute.
		 */
		$image = wp_get_attachment_image( $custom_logo_id, 'full', false, $custom_logo_attr );

		if ( $unlink_homepage_logo && is_front_page() && ! is_paged() ) {
			// If on the home page, don't link the logo to home.
			$html = sprintf(
				'<span class="custom-logo-link">%1$s</span>',
				$image
			);
		} else {
			$aria_current = is_front_page() && ! is_paged() ? ' aria-current="page"' : '';

			$html = sprintf(
				'<a href="%1$s" class="custom-logo-link" rel="home"%2$s>%3$s</a>',
				esc_url( home_url( '/' ) ),
				$aria_current,
				$image
			);
		}
	} elseif ( is_customize_preview() ) {
		// If no logo is set but we're in the Customizer, leave a placeholder (needed for the live preview).
		$html = sprintf(
			'<a href="%1$s" class="custom-logo-link" style="display:none;"><img class="custom-logo"/></a>',
			esc_url( home_url( '/' ) )
		);
	}

	if ( $switched_blog ) {
		restore_current_blog();
	}

	/**
	 * Filters the custom logo output.
	 *
	 * @since 4.5.0
	 * @since 4.6.0 Added the `$blog_id` parameter.
	 *
	 * @param string $html    Custom logo HTML output.
	 * @param int    $blog_id ID of the blog to get the custom logo for.
	 */
	return apply_filters( 'get_custom_logo', $html, $blog_id );
}

/**
 * Displays a custom logo, linked to home unless the theme supports removing the link on the home page.
 *
 * @since 4.5.0
 *
 * @param int $blog_id Optional. ID of the blog in question. Default is the ID of the current blog.
 */
function the_custom_logo( $blog_id = 0 ) {
	echo get_custom_logo( $blog_id );
}

/**
 * Returns document title for the current page.
 *
 * @since 4.4.0
 *
 * @global int $page  Page number of a single post.
 * @global int $paged Page number of a list of posts.
 *
 * @return string Tag with the document title.
 */
function wp_get_document_title() {

	/**
	 * Filters the document title before it is generated.
	 *
	 * Passing a non-empty value will short-circuit wp_get_document_title(),
	 * returning that value instead.
	 *
	 * @since 4.4.0
	 *
	 * @param string $title The document title. Default empty string.
	 */
	$title = apply_filters( 'pre_get_document_title', '' );
	if ( ! empty( $title ) ) {
		return $title;
	}

	global $page, $paged;

	$title = array(
		'title' => '',
	);