diff --git a/assets/dist/mix-manifest.json b/assets/dist/mix-manifest.json
index 11f74424c..0ca7dddf2 100644
--- a/assets/dist/mix-manifest.json
+++ b/assets/dist/mix-manifest.json
@@ -1,5 +1,5 @@
 {
-    "/scripts/a11y.js": "/scripts/a11y.js?id=f0993aaabbea8a79233b",
+    "/scripts/a11y.js": "/scripts/a11y.js?id=d41e757e292e7d6c5240",
     "/scripts/anchor.js": "/scripts/anchor.js?id=aafffcd9fd35558755fa",
     "/styles/catalog.css": "/styles/catalog.css?id=5592c3bde401d0205d10",
     "/styles/colors-pb.css": "/styles/colors-pb.css?id=453776ab723bb7b7a9b8",
@@ -50,4 +50,4 @@
     "/scripts/select2.js": "/scripts/select2.js?id=e66208e306a3e3b57128",
     "/scripts/sidr.js": "/scripts/sidr.js?id=32495427b04ceeab5376",
     "/scripts/table.js": "/scripts/table.js?id=f76268f8f2e9c0e802ff"
-}
+}
diff --git a/assets/dist/scripts/a11y.js b/assets/dist/scripts/a11y.js
index 5c96c4853..20a2459e8 100644
--- a/assets/dist/scripts/a11y.js
+++ b/assets/dist/scripts/a11y.js
@@ -1 +1 @@
-!function(e){var t={};function n(r){if(t[r])return t[r].exports;var o=t[r]={i:r,l:!1,exports:{}};return e[r].call(o.exports,o,o.exports,n),o.l=!0,o.exports}n.m=e,n.c=t,n.d=function(e,t,r){n.o(e,t)||Object.defineProperty(e,t,{enumerable:!0,get:r})},n.r=function(e){"undefined"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(e,Symbol.toStringTag,{value:"Module"}),Object.defineProperty(e,"__esModule",{value:!0})},n.t=function(e,t){if(1&t&&(e=n(e)),8&t)return e;if(4&t&&"object"==typeof e&&e&&e.__esModule)return e;var r=Object.create(null);if(n.r(r),Object.defineProperty(r,"default",{enumerable:!0,value:e}),2&t&&"string"!=typeof e)for(var o in e)n.d(r,o,function(t){return e[t]}.bind(null,o));return r},n.n=function(e){var t=e&&e.__esModule?function(){return e.default}:function(){return e};return n.d(t,"a",t),t},n.o=function(e,t){return Object.prototype.hasOwnProperty.call(e,t)},n.p="/",n(n.s=26)}({26:function(e,t,n){e.exports=n("D1fj")},D1fj:function(e,t){document.addEventListener("DOMContentLoaded",function(){function e(e,t,n){for(var r=document.querySelectorAll(e),o=0;o<r.length;o++)r[o].setAttribute(t,n)}e("table.wp-list-table th","role","columnheader"),e("table.form-table","role","none")})}});
\ No newline at end of file
+!function(e){var t={};function r(n){if(t[n])return t[n].exports;var o=t[n]={i:n,l:!1,exports:{}};return e[n].call(o.exports,o,o.exports,r),o.l=!0,o.exports}r.m=e,r.c=t,r.d=function(e,t,n){r.o(e,t)||Object.defineProperty(e,t,{enumerable:!0,get:n})},r.r=function(e){"undefined"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(e,Symbol.toStringTag,{value:"Module"}),Object.defineProperty(e,"__esModule",{value:!0})},r.t=function(e,t){if(1&t&&(e=r(e)),8&t)return e;if(4&t&&"object"==typeof e&&e&&e.__esModule)return e;var n=Object.create(null);if(r.r(n),Object.defineProperty(n,"default",{enumerable:!0,value:e}),2&t&&"string"!=typeof e)for(var o in e)r.d(n,o,function(t){return e[t]}.bind(null,o));return n},r.n=function(e){var t=e&&e.__esModule?function(){return e.default}:function(){return e};return r.d(t,"a",t),t},r.o=function(e,t){return Object.prototype.hasOwnProperty.call(e,t)},r.p="/",r(r.s=26)}({26:function(e,t,r){e.exports=r("D1fj")},D1fj:function(e,t){document.addEventListener("DOMContentLoaded",function(){function e(e,t,r){for(var n=document.querySelectorAll(e),o=0;o<n.length;o++)n[o].setAttribute(t,r)}e("table.form-table","role","none"),e("table.wp-list-table th","role","columnheader"),e("div.updated","role","status"),e("div.notice","role","status"),e("div.error","role","alert")})}});
\ No newline at end of file
diff --git a/assets/src/scripts/a11y.js b/assets/src/scripts/a11y.js
index a88f77494..488dc1912 100644
--- a/assets/src/scripts/a11y.js
+++ b/assets/src/scripts/a11y.js
@@ -7,6 +7,16 @@ document.addEventListener( 'DOMContentLoaded', function () {
 		}
 	}
 
-	addAttribute( 'table.wp-list-table th', 'role', 'columnheader' );
+	// <table> output by do_settings_sections() should have a role="none" attribute
+	// https://core.trac.wordpress.org/ticket/46899
 	addAttribute( 'table.form-table', 'role', 'none' );
-} )
+
+	// WP_List_Table table headers are missing `role=`columnheader` for accessibility
+	// https://core.trac.wordpress.org/ticket/46977
+	addAttribute( 'table.wp-list-table th', 'role', 'columnheader' );
+
+	// Add attributes to make status and alert bars accessible
+	addAttribute( 'div.updated', 'role', 'status' );
+	addAttribute( 'div.notice', 'role', 'status' );
+	addAttribute( 'div.error', 'role', 'alert' );
+} );
diff --git a/compatibility.php b/compatibility.php
index a88cadc32..f781e6a7b 100644
--- a/compatibility.php
+++ b/compatibility.php
@@ -165,7 +165,7 @@ function _pb_copy_autoloader() {
  */
 function _pb_minimum_php() {
 	global $pb_minimum_php;
-	echo '<div id="message" class="error fade"><p>';
+	echo '<div id="message" role="alert" class="error fade"><p>';
 	printf(
 		esc_attr__( 'Pressbooks will not work with your version of PHP. Pressbooks requires PHP version %s or greater. Please upgrade PHP if you would like to use Pressbooks.', 'pressbooks' ),
 		esc_attr( $pb_minimum_php )
@@ -178,7 +178,7 @@ function _pb_minimum_php() {
  */
 function _pb_minimum_wp() {
 	global $pb_minimum_wp;
-	echo '<div id="message" class="error fade"><p>';
+	echo '<div id="message" role="alert" class="error fade"><p>';
 	printf(
 		esc_attr__( 'Pressbooks will not work with your version of WordPress. Pressbooks requires a dedicated install of WordPress Multisite, version %s or greater. Please upgrade WordPress if you would like to use Pressbooks.', 'pressbooks' ),
 		esc_attr( $pb_minimum_wp )
@@ -190,7 +190,7 @@ function _pb_minimum_wp() {
  * Echo message about Pressbooks not active
  */
 function _pb_disabled() {
-	echo '<div id="message" class="error fade"><p>';
+	echo '<div id="message" role="alert" class="error fade"><p>';
 	_e( 'The Pressbooks plugin is inactive, but you have active plugins that require Pressbooks. This is causing errors. Please go to the Plugins page, and activate Pressbooks.', 'pressbooks' );
 	echo '</p></div>';
 }
diff --git a/inc/admin/analytics/namespace.php b/inc/admin/analytics/namespace.php
index 7fc0c5910..81b744e1f 100644
--- a/inc/admin/analytics/namespace.php
+++ b/inc/admin/analytics/namespace.php
@@ -181,7 +181,7 @@ function display_network_analytics_settings() {
 					delete_site_option( 'ga_mu_site_specific_allowed' );
 				}
 				?>
-				<div id="message" class="updated notice is-dismissible"><p><strong><?php _e( 'Settings saved.', 'pressbooks' ); ?></strong></div>
+				<div id="message" role="status" class="updated notice is-dismissible"><p><strong><?php _e( 'Settings saved.', 'pressbooks' ); ?></strong></div>
 				<?php
 			}
 		}
diff --git a/inc/admin/laf/namespace.php b/inc/admin/laf/namespace.php
index 6b422d46d..9eec6c169 100644
--- a/inc/admin/laf/namespace.php
+++ b/inc/admin/laf/namespace.php
@@ -1339,14 +1339,14 @@ function admin_notices() {
 	// Print the error(s).
 	$errors_to_print = \Pressbooks\get_all_errors();
 	foreach ( $errors_to_print as $msg ) {
-		echo '<div class="error"><p>' . $msg . '</p></div>';
+		echo '<div class="error" role="alert"><p>' . $msg . '</p></div>';
 	}
 	\Pressbooks\flush_all_errors();
 
 	// Print the notice(s).
 	$notices_to_print = \Pressbooks\get_all_notices();
 	foreach ( $notices_to_print as $msg ) {
-		echo '<div class="updated"><p>' . $msg . '</p></div>';
+		echo '<div class="updated" role="status"><p>' . $msg . '</p></div>';
 	}
 	\Pressbooks\flush_all_notices();
 }
diff --git a/inc/admin/network/class-sharingandprivacyoptions.php b/inc/admin/network/class-sharingandprivacyoptions.php
index 672906647..4594e3c94 100644
--- a/inc/admin/network/class-sharingandprivacyoptions.php
+++ b/inc/admin/network/class-sharingandprivacyoptions.php
@@ -126,7 +126,7 @@ function render() {
 					}
 					update_site_option( $_option, $options );
 					?>
-					<div id="message" class="updated notice is-dismissible"><p><strong><?php _e( 'Settings saved.', 'pressbooks' ); ?></strong></div>
+					<div id="message" role="status" class="updated notice is-dismissible"><p><strong><?php _e( 'Settings saved.', 'pressbooks' ); ?></strong></div>
 					<?php
 				}
 			}
diff --git a/inc/modules/export/namespace.php b/inc/modules/export/namespace.php
index fcd0629d7..5b165af7b 100644
--- a/inc/modules/export/namespace.php
+++ b/inc/modules/export/namespace.php
@@ -89,7 +89,7 @@ function dependency_errors_msg() {
 	$formats = implode( ', ', $dependency_errors );
 	$pos = strrpos( $formats, ', ' );
 	$dependency_errors_msg = sprintf(
-		'<div class="error"><p>%s</p></div>',
+		'<div class="error" role="alert"><p>%s</p></div>',
 		sprintf(
 			__( 'Some dependencies for %1$s exports could not be found. Please verify that you have completed the <a href="%2$s">installation instructions</a>.', 'pressbooks' ),
 			( $pos ) ? substr_replace( $formats, ', ' . __( 'and', 'pressbooks' ) . ' ', $pos, strlen( ', ' ) ) : $formats,
diff --git a/inc/modules/searchandreplace/class-searchandreplace.php b/inc/modules/searchandreplace/class-searchandreplace.php
index df7a1610e..600ee4698 100644
--- a/inc/modules/searchandreplace/class-searchandreplace.php
+++ b/inc/modules/searchandreplace/class-searchandreplace.php
@@ -138,7 +138,7 @@ public function adminScreen() {
 				$this->renderError( $results );
 			} elseif ( isset( $_POST['replace_and_save'] ) ) {
 				?>
-				<div class="updated" id="message" onclick="this.parentNode.removeChild (this)">
+				<div class="updated" id="message" role="status" onclick="this.parentNode.removeChild (this)">
 					<p><?php printf( _n( '%d occurrence replaced.', '%d occurrences replaced.', count( $results ) ), count( $results ) ); ?></p>
 				</div>
 				<?php
diff --git a/inc/theme/namespace.php b/inc/theme/namespace.php
index 6d318c8b3..97bbdd821 100644
--- a/inc/theme/namespace.php
+++ b/inc/theme/namespace.php
@@ -132,7 +132,7 @@ function migrate_book_themes() {
 				add_action(
 					'admin_notices', function () {
 						/* translators: 1: URL to Luther theme */
-						echo '<div id="message" class="error fade"><p>' . sprintf(
+						echo '<div id="message" role="alert" class="error fade"><p>' . sprintf(
 							__( 'Luther has been replaced with McLuhan as Pressbooks’ default book theme. To continue using Luther for your book, please ensure that the standalone <a href="%1$s">Luther theme</a> is installed and network activated.', 'pressbooks' ),
 							'https://github.com/pressbooks/pressbooks-luther/'
 						) . '</p></div>';
diff --git a/pressbooks.php b/pressbooks.php
index 7ca14d93f..d27dc660c 100644
--- a/pressbooks.php
+++ b/pressbooks.php
@@ -83,7 +83,7 @@ function _pb_default_book_theme() {
 if ( ! function_exists( 'pb_meets_minimum_requirements' ) && ! @include_once( PB_PLUGIN_DIR . 'compatibility.php' ) ) { // @codingStandardsIgnoreLine
 	return add_action(
 		'admin_notices', function () {
-			echo '<div id="message" class="error fade"><p>' . __( 'Cannot find Pressbooks install.', 'pressbooks' ) . '</p></div>';
+			echo '<div id="message" role="alert" class="error fade"><p>' . __( 'Cannot find Pressbooks install.', 'pressbooks' ) . '</p></div>';
 		}
 	);
 } elseif ( ! pb_meets_minimum_requirements() ) {
diff --git a/symbionts/pressbooks-latex/pb-latex-admin.php b/symbionts/pressbooks-latex/pb-latex-admin.php
index 6f8ecbe3d..79cfaff21 100644
--- a/symbionts/pressbooks-latex/pb-latex-admin.php
+++ b/symbionts/pressbooks-latex/pb-latex-admin.php
@@ -123,7 +123,7 @@ function testImage() {
 
 		if ( is_wp_error( $url ) ) {
 			$code = $url->get_error_code();
-			$message = '<div class="error"><p>' . $url->get_error_message() . "</p></div>\n";
+			$message = '<div class="error" role="alert"><p>' . $url->get_error_message() . "</p></div>\n";
 			echo $message;
 		} else {
 			$alt = esc_attr( __( 'Test Image', 'pressbooks' ) );
diff --git a/templates/admin/covergenerator.php b/templates/admin/covergenerator.php
index 175519d11..4a23a5168 100644
--- a/templates/admin/covergenerator.php
+++ b/templates/admin/covergenerator.php
@@ -47,7 +47,7 @@
 	if ( ! empty( $dependency_messages ) ) {
 		$formats = implode( ', ', $dependency_messages );
 		printf(
-			'<div class="error"><p>%s</p></div>',
+			'<div class="error" role="alert"><p>%s</p></div>',
 			sprintf(
 				__( 'Some dependencies for %1$s exports could not be found. Please verify that you have completed the <a href="%2$s">installation instructions</a>.', 'pressbooks' ),
 				( $pos = strrpos( $formats, ', ' ) ) ? substr_replace( $formats, ', ' . __( 'and', 'pressbooks' ) . ' ', $pos, strlen( ', ' ) ) : $formats,
diff --git a/templates/admin/custom-styles.php b/templates/admin/custom-styles.php
index 6cfab8c3a..01de6d627 100644
--- a/templates/admin/custom-styles.php
+++ b/templates/admin/custom-styles.php
@@ -30,7 +30,7 @@
 
 if ( ! empty( $_GET['custom_styles_error'] ) ) {
 	// Conversion failed
-	printf( '<div class="error">%s</div>', __( 'Error: Something went wrong. See logs for more details.', 'pressbooks' ) );
+	printf( '<div class="error" role="alert">%s</div>', __( 'Error: Something went wrong. See logs for more details.', 'pressbooks' ) );
 }
 
 ?>
diff --git a/templates/admin/dashboard.php b/templates/admin/dashboard.php
index 953e646bb..a8d62d703 100644
--- a/templates/admin/dashboard.php
+++ b/templates/admin/dashboard.php
@@ -25,7 +25,7 @@
 		}
 
 		update_site_option( 'pressbooks_dashboard_feed', $options ); ?>
-		<div id="message" class="updated notice is-dismissible"><p><strong><?php _e( 'Settings saved.', 'pressbooks-oauth' ); ?></strong></div>
+		<div id="message" role="status" class="updated notice is-dismissible"><p><strong><?php _e( 'Settings saved.', 'pressbooks-oauth' ); ?></strong></div>
 		<?php }
 } ?>
 
diff --git a/templates/admin/export.php b/templates/admin/export.php
index 5306621e9..47657efe2 100644
--- a/templates/admin/export.php
+++ b/templates/admin/export.php
@@ -107,7 +107,7 @@
 	if ( ! empty( $dependency_messages ) ) {
 		$formats = implode( ', ', $dependency_messages );
 		printf(
-			'<div class="error"><p>%s</p></div>',
+			'<div class="error" role="alert"><p>%s</p></div>',
 			sprintf(
 				__( 'Some dependencies for %1$s exports could not be found. Please verify that you have completed the <a href="%2$s">installation instructions</a>.', 'pressbooks' ),
 				( $pos = strrpos( $formats, ', ' ) ) ? substr_replace( $formats, ', ' . __( 'and', 'pressbooks' ) . ' ', $pos, strlen( ', ' ) ) : $formats,
diff --git a/tests/test-admin-laf.php b/tests/test-admin-laf.php
index 1fdff94db..417f86860 100644
--- a/tests/test-admin-laf.php
+++ b/tests/test-admin-laf.php
@@ -171,7 +171,7 @@ function test_admin_notices() {
 		ob_start();
 		\Pressbooks\Admin\Laf\admin_notices();
 		$buffer = ob_get_clean();
-		$this->assertEquals( '<div class="error"><p>One</p></div><div class="error"><p>Two</p></div><div class="updated"><p>Three</p></div><div class="updated"><p>Four</p></div>', $buffer );
+		$this->assertEquals( '<div class="error" role="alert"><p>One</p></div><div class="error" role="alert"><p>Two</p></div><div class="updated" role="status"><p>Three</p></div><div class="updated" role="status"><p>Four</p></div>', $buffer );
 
 		$_SESSION['pb_errors'][] = 'One';
 		$_SESSION['pb_errors'][] = 'Two';
@@ -182,7 +182,7 @@ function test_admin_notices() {
 		ob_start();
 		\Pressbooks\Admin\Laf\admin_notices();
 		$buffer = ob_get_clean();
-		$this->assertEquals( '<div class="error"><p>One</p></div><div class="error"><p>Two</p></div><div class="error"><p>Three</p></div><div class="error"><p>Four</p></div><div class="updated"><p>Five</p></div><div class="updated"><p>Six</p></div><div class="updated"><p>Seven</p></div><div class="updated"><p>Eight</p></div>', $buffer );
+		$this->assertEquals( '<div class="error" role="alert"><p>One</p></div><div class="error" role="alert"><p>Two</p></div><div class="error" role="alert"><p>Three</p></div><div class="error" role="alert"><p>Four</p></div><div class="updated" role="status"><p>Five</p></div><div class="updated" role="status"><p>Six</p></div><div class="updated" role="status"><p>Seven</p></div><div class="updated" role="status"><p>Eight</p></div>', $buffer );
 
 		\Pressbooks\add_error( 'A' );
 		\Pressbooks\add_error( 'B' );
@@ -191,7 +191,7 @@ function test_admin_notices() {
 		ob_start();
 		\Pressbooks\Admin\Laf\admin_notices();
 		$buffer = ob_get_clean();
-		$this->assertEquals( '<div class="error"><p>A</p></div><div class="error"><p>B</p></div><div class="updated"><p>C</p></div><div class="updated"><p>D</p></div>', $buffer );
+		$this->assertEquals( '<div class="error" role="alert"><p>A</p></div><div class="error" role="alert"><p>B</p></div><div class="updated" role="status"><p>C</p></div><div class="updated" role="status"><p>D</p></div>', $buffer );
 
 		ob_start();
 		\Pressbooks\Admin\Laf\admin_notices();