diff --git a/wp-includes/formatting.php b/wp-includes/formatting.php
index 38a4a113a9..c524b06928 100644
--- a/wp-includes/formatting.php
+++ b/wp-includes/formatting.php
@@ -2514,9 +2514,9 @@ function force_balance_tags( $text ) {
 	$tagqueue  = '';
 	$newtext   = '';
 	// Known single-entity/self-closing tags.
-	$single_tags = array( 'area', 'base', 'basefont', 'br', 'col', 'command', 'embed', 'frame', 'hr', 'img', 'input', 'isindex', 'link', 'meta', 'param', 'source' );
+	$single_tags = array( 'area', 'base', 'basefont', 'br', 'col', 'command', 'embed', 'frame', 'hr', 'img', 'input', 'isindex', 'link', 'meta', 'param', 'source', 'track', 'wbr' );
 	// Tags that can be immediately nested within themselves.
-	$nestable_tags = array( 'blockquote', 'div', 'object', 'q', 'span' );
+	$nestable_tags = array( 'article', 'aside', 'blockquote', 'details', 'div', 'figure', 'object', 'q', 'section', 'span' );
 
 	// WP bug fix for comments - in case you REALLY meant to type '< !--'.
 	$text = str_replace( '< !--', '<    !--', $text );
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 30d868fe2d..2df31031a7 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.9-alpha-52187';
+$wp_version = '5.9-alpha-52188';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.