Index: src/wp-admin/includes/class-wp-list-table.php
===================================================================
--- src/wp-admin/includes/class-wp-list-table.php	(revision 46568)
+++ src/wp-admin/includes/class-wp-list-table.php	(working copy)
@@ -631,12 +631,15 @@
 		<div class="view-switch">
 		<?php
 		foreach ( $this->modes as $mode => $title ) {
-			$classes = array( 'view-' . $mode );
+			$classes      = array( 'view-' . $mode );
+			$aria_current = '';
+
 			if ( $current_mode === $mode ) {
-				$classes[] = 'current';
+				$classes[]    = 'current';
+				$aria_current = ' aria-current="page"';
 			}
 			printf(
-				"<a href='%s' class='%s' id='view-switch-$mode'><span class='screen-reader-text'>%s</span></a>\n",
+				"<a href='%s' class='%s' id='view-switch-$mode'$aria_current><span class='screen-reader-text'>%s</span></a>\n",
 				esc_url( add_query_arg( 'mode', $mode ) ),
 				implode( ' ', $classes ),
 				$title
Index: src/wp-includes/media-template.php
===================================================================
--- src/wp-includes/media-template.php	(revision 46568)
+++ src/wp-includes/media-template.php	(working copy)
@@ -318,7 +318,7 @@
 		<a href="<?php echo esc_url( add_query_arg( 'mode', 'list', $_SERVER['REQUEST_URI'] ) ); ?>" class="view-list">
 			<span class="screen-reader-text"><?php _e( 'List View' ); ?></span>
 		</a>
-		<a href="<?php echo esc_url( add_query_arg( 'mode', 'grid', $_SERVER['REQUEST_URI'] ) ); ?>" class="view-grid current">
+		<a href="<?php echo esc_url( add_query_arg( 'mode', 'grid', $_SERVER['REQUEST_URI'] ) ); ?>" class="view-grid current" aria-current="page">
 			<span class="screen-reader-text"><?php _e( 'Grid View' ); ?></span>
 		</a>
 	</script>