Index: src/wp-admin/includes/admin-filters.php
===================================================================
--- src/wp-admin/includes/admin-filters.php	(revision 37332)
+++ src/wp-admin/includes/admin-filters.php	(working copy)
@@ -43,7 +43,8 @@
 add_action( 'admin_head', 'wp_site_icon'             );
 add_action( 'admin_head', '_ipad_meta'               );
 
-add_action( 'post_edit_form_tag', 'post_form_autocomplete_off' );
+add_action( 'admin_print_scripts-post.php',     'wp_page_reload_on_back_button_js' );
+add_action( 'admin_print_scripts-post-new.php', 'wp_page_reload_on_back_button_js' );
 
 add_action( 'update_option_home',          'update_home_siteurl', 10, 2 );
 add_action( 'update_option_siteurl',       'update_home_siteurl', 10, 2 );
Index: src/wp-admin/includes/deprecated.php
===================================================================
--- src/wp-admin/includes/deprecated.php	(revision 37332)
+++ src/wp-admin/includes/deprecated.php	(working copy)
@@ -1373,3 +1373,26 @@
 
 	return add_menu_page($page_title, $menu_title, $capability, $menu_slug, $function, $icon_url, $_wp_last_utility_menu);
 }
+
+/**
+ * Disables autocomplete on the 'post' form (Add/Edit Post screens) for WebKit browsers,
+ * as they disregard the autocomplete setting on the editor textarea. That can break the editor
+ * when the user navigates to it with the browser's Back button. See #28037
+ *
+ * Replaced with wp_page_reload_on_back_button_js() that also fixes this problem.
+ *
+ * @since 4.0.0
+ * $deprecated 4.6.0
+ *
+ * @global bool $is_safari
+ * @global bool $is_chrome
+ */
+function post_form_autocomplete_off() {
+	global $is_safari, $is_chrome;
+
+	_deprecated_function( __FUNCTION__, '4.6' );
+
+	if ( $is_safari || $is_chrome ) {
+		echo ' autocomplete="off"';
+	}
+}
Index: src/wp-admin/includes/misc.php
===================================================================
--- src/wp-admin/includes/misc.php	(revision 37332)
+++ src/wp-admin/includes/misc.php	(working copy)
@@ -892,24 +892,6 @@
 }
 
 /**
- * Disables autocomplete on the 'post' form (Add/Edit Post screens) for WebKit browsers,
- * as they disregard the autocomplete setting on the editor textarea. That can break the editor
- * when the user navigates to it with the browser's Back button. See #28037
- *
- * @since 4.0.0
- *
- * @global bool $is_safari
- * @global bool $is_chrome
- */
-function post_form_autocomplete_off() {
-	global $is_safari, $is_chrome;
-
-	if ( $is_safari || $is_chrome ) {
-		echo ' autocomplete="off"';
-	}
-}
-
-/**
  * Remove single-use URL parameters and create canonical link based on new URL.
  *
  * Remove specific query string parameters from a URL, create the canonical link,
@@ -936,3 +918,21 @@
 	</script>
 <?php
 }
+
+/**
+ * Output JS that reloads the page if the user navigated to it with the Back or Forward button.
+ *
+ * Used on the Edit Post and Add New Post screens. Needed to ensure the page is not loaded from browser cache,
+ * so the post title and editor content are the last saved versions. Ideally this script should run first in the head.
+ *
+ * @since 4.6.0
+ */
+function wp_page_reload_on_back_button_js() {
+	?>
+	<script>
+		if ( typeof performance !== 'undefined' && performance.navigation && performance.navigation.type === 2 ) {
+			document.location.reload( true );
+		}
+	</script>
+	<?php
+}