diff --git a/wp-admin/includes/update-core.php b/wp-admin/includes/update-core.php
index d031a901e0..e0ac9450ef 100644
--- a/wp-admin/includes/update-core.php
+++ b/wp-admin/includes/update-core.php
@@ -786,6 +786,9 @@ $_old_files = array(
 	// 5.1
 	'wp-includes/random_compat/random_bytes_openssl.php',
 	'wp-includes/js/tinymce/wp-tinymce.js.gz',
+	// 5.3
+	'wp-includes/js/wp-a11y.js', // Moved to: wp-includes/js/dist/a11y.js
+	'wp-includes/js/wp-a11y.min.js', // Moved to: wp-includes/js/dist/a11y.min.js
 );
 
 /**
diff --git a/wp-includes/js/wp-a11y.js b/wp-includes/js/wp-a11y.js
deleted file mode 100644
index 648b629d37..0000000000
--- a/wp-includes/js/wp-a11y.js
+++ /dev/null
@@ -1,107 +0,0 @@
-/**
- * @output wp-includes/js/wp-a11y.js
- */
-
-/** @namespace wp */
-window.wp = window.wp || {};
-
-( function ( wp, $ ) {
-	'use strict';
-
-	var $containerPolite,
-		$containerAssertive,
-		previousMessage = '';
-
-	/**
-	 * Update the ARIA live notification area text node.
-	 *
-	 * @since 4.2.0
-	 * @since 4.3.0 Introduced the 'ariaLive' argument.
-	 *
-	 * @param {String} message    The message to be announced by Assistive Technologies.
-	 * @param {String} [ariaLive] The politeness level for aria-live. Possible values:
-	 *                            polite or assertive. Default polite.
-	 * @returns {void}
-	 */
-	function speak( message, ariaLive ) {
-		// Clear previous messages to allow repeated strings being read out.
-		clear();
-
-		// Remove HTML tags, ensuring only text is sent to screen readers.
-		message = wp.sanitize.stripTagsAndEncodeText( message );
-
-		/*
-		 * Safari 10+VoiceOver don't announce repeated, identical strings. We use
-		 * a `no-break space` to force them to think identical strings are different.
-		 * See ticket #36853.
-		 */
-		if ( previousMessage === message ) {
-			message = message + '\u00A0';
-		}
-
-		previousMessage = message;
-
-		if ( $containerAssertive && 'assertive' === ariaLive ) {
-			$containerAssertive.text( message );
-		} else if ( $containerPolite ) {
-			$containerPolite.text( message );
-		}
-	}
-
-	/**
-	 * Build the live regions markup.
-	 *
-	 * @since 4.3.0
-	 *
-	 * @param {String} ariaLive Optional. Value for the 'aria-live' attribute, default 'polite'.
-	 *
-	 * @return {Object} $container The ARIA live region jQuery object.
-	 */
-	function addContainer( ariaLive ) {
-		ariaLive = ariaLive || 'polite';
-
-		var $container = $( '<div>', {
-			'id': 'wp-a11y-speak-' + ariaLive,
-			'aria-live': ariaLive,
-			'aria-relevant': 'additions text',
-			'aria-atomic': 'true',
-			'class': 'screen-reader-text wp-a11y-speak-region'
-		});
-
-		$( document.body ).append( $container );
-		return $container;
-	}
-
-	/**
-	 * Clear the live regions.
-	 *
-	 * @since 4.3.0
-	 */
-	function clear() {
-		$( '.wp-a11y-speak-region' ).text( '' );
-	}
-
-	/**
-	 * Initialize wp.a11y and define ARIA live notification area.
-	 *
-	 * @since 4.2.0
-	 * @since 4.3.0 Added the assertive live region.
-	 */
-	$( document ).ready( function() {
-		$containerPolite = $( '#wp-a11y-speak-polite' );
-		$containerAssertive = $( '#wp-a11y-speak-assertive' );
-
-		if ( ! $containerPolite.length ) {
-			$containerPolite = addContainer( 'polite' );
-		}
-
-		if ( ! $containerAssertive.length ) {
-			$containerAssertive = addContainer( 'assertive' );
-		}
-	});
-
-	/** @namespace wp.a11y */
-	wp.a11y = wp.a11y || {};
-	wp.a11y.speak = speak;
-
-}( window.wp, window.jQuery ));
diff --git a/wp-includes/js/wp-a11y.min.js b/wp-includes/js/wp-a11y.min.js
deleted file mode 100644
index 81c34e3f7b..0000000000
--- a/wp-includes/js/wp-a11y.min.js
+++ /dev/null
@@ -1 +0,0 @@
-window.wp=window.wp||{},function(a,b){"use strict";function c(b,c){e(),b=a.sanitize.stripTagsAndEncodeText(b),h===b&&(b+="\xa0"),h=b,g&&"assertive"===c?g.text(b):f&&f.text(b)}function d(a){a=a||"polite";var c=b("<div>",{id:"wp-a11y-speak-"+a,"aria-live":a,"aria-relevant":"additions text","aria-atomic":"true","class":"screen-reader-text wp-a11y-speak-region"});return b(document.body).append(c),c}function e(){b(".wp-a11y-speak-region").text("")}var f,g,h="";b(document).ready(function(){f=b("#wp-a11y-speak-polite"),g=b("#wp-a11y-speak-assertive"),f.length||(f=d("polite")),g.length||(g=d("assertive"))}),a.a11y=a.a11y||{},a.a11y.speak=c}(window.wp,window.jQuery);
\ No newline at end of file
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 8ef3817ef5..01c466655e 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-alpha-46166';
+$wp_version = '5.3-alpha-46167';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.