diff --git a/wp-includes/html-api/class-wp-html-tag-processor.php b/wp-includes/html-api/class-wp-html-tag-processor.php
index e2632c80f6..39390621e8 100644
--- a/wp-includes/html-api/class-wp-html-tag-processor.php
+++ b/wp-includes/html-api/class-wp-html-tag-processor.php
@@ -1668,7 +1668,7 @@ class WP_HTML_Tag_Processor {
 				 *
 				 * @see https://html.spec.whatwg.org/#tag-open-state
 				 */
-				if ( 1 !== strspn( $html, '!/?abcdefghijklmnopqrstuvwxyzABCEFGHIJKLMNOPQRSTUVWXYZ', $at + 1, 1 ) ) {
+				if ( 1 !== strspn( $html, '!/?abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ', $at + 1, 1 ) ) {
 					++$at;
 					continue;
 				}
diff --git a/wp-includes/version.php b/wp-includes/version.php
index ca6c01fcb1..432b44f16d 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.8-alpha-59463';
+$wp_version = '6.8-alpha-59464';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.