diff --git a/wp-includes/theme-templates.php b/wp-includes/theme-templates.php
index 467dcac941..6659721475 100644
--- a/wp-includes/theme-templates.php
+++ b/wp-includes/theme-templates.php
@@ -165,7 +165,7 @@ function the_block_template_skip_link() {
 	<script>
 	( function() {
 		var skipLinkTarget = document.querySelector( 'main' ),
-			parentEl,
+			sibling,
 			skipLinkTargetID,
 			skipLink;
 
@@ -176,10 +176,10 @@ function the_block_template_skip_link() {
 
 		// Get the site wrapper.
 		// The skip-link will be injected in the beginning of it.
-		parentEl = document.querySelector( '.wp-site-blocks' );
+		sibling = document.querySelector( '.wp-site-blocks' );
 
 		// Early exit if the root element was not found.
-		if ( ! parentEl ) {
+		if ( ! sibling ) {
 			return;
 		}
 
@@ -197,7 +197,7 @@ function the_block_template_skip_link() {
 		skipLink.innerHTML = '<?php esc_html_e( 'Skip to content' ); ?>';
 
 		// Inject the skip link.
-		parentEl.insertAdjacentElement( 'afterbegin', skipLink );
+		sibling.parentElement.insertBefore( skipLink, sibling );
 	}() );
 	</script>
 	<?php
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 3f5097791d..237d534603 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.9-alpha-52242';
+$wp_version = '5.9-alpha-52243';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.