Accessibility: Themes: Only unlink custom logo on the home page if the theme declares support for that.

To accommodate for the change, the `custom-logo` theme feature now accepts the `unlink-homepage-logo` parameter.

If and when the logo is linked on the home page, the link has the `aria-current` attribute for better accessibility.

Follow-up to [48039], [48283].

Props sabernhardt, audrasjb, johnstonphilip, demetris.
Fixes #37011.
Built from https://develop.svn.wordpress.org/trunk@48749


git-svn-id: http://core.svn.wordpress.org/trunk@48511 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/general-template.php

@@ -1021,7 +1021,9 @@ function get_custom_logo( $blog_id = 0 ) {
 			'class' => 'custom-logo',
 		);
 
-		if ( is_front_page() ) {
+		$unlink_homepage_logo = (bool) get_theme_support( 'custom-logo', 'unlink-homepage-logo' );
+
+		if ( $unlink_homepage_logo && is_front_page() && ! is_paged() ) {
 			/*
 			 * 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.
@@ -1055,16 +1057,19 @@ function get_custom_logo( $blog_id = 0 ) {
 		 */
 		$image = wp_get_attachment_image( $custom_logo_id, 'full', false, $custom_logo_attr );
 
-		if ( is_front_page() ) {
+		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$s</a>',
+				'<a href="%1$s" class="custom-logo-link" rel="home"%2$s>%3$s</a>',
 				esc_url( home_url( '/' ) ),
+				$aria_current,
 				$image
 			);
 		}

wp-includes/theme.php

@@ -2472,6 +2472,7 @@ function get_theme_starter_content() {
  * @since 5.3.0 Formalized the existing and already documented `...$args` parameter
  *              by adding it to the function signature.
  * @since 5.5.0 The `core-block-patterns` feature was added and is enabled by default.
+ * @since 5.5.0 The `custom-logo` feature now also accepts 'unlink-homepage-logo'.
  *
  * @global array $_wp_theme_features
  *
@@ -2538,11 +2539,12 @@ function add_theme_support( $feature, ...$args ) {
 				$args = array( 0 => array() );
 			}
 			$defaults = array(
-				'width'       => null,
-				'height'      => null,
-				'flex-width'  => false,
-				'flex-height' => false,
-				'header-text' => '',
+				'width'                => null,
+				'height'               => null,
+				'flex-width'           => false,
+				'flex-height'          => false,
+				'header-text'          => '',
+				'unlink-homepage-logo' => false,
 			);
 			$args[0]  = wp_parse_args( array_intersect_key( $args[0], $defaults ), $defaults );
 

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.6-alpha-48748';
+$wp_version = '5.6-alpha-48749';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.