Index: src/wp-admin/css/forms.css
===================================================================
--- src/wp-admin/css/forms.css	(revision 49223)
+++ src/wp-admin/css/forms.css	(working copy)
@@ -238,10 +238,12 @@
 	color: #72777c;
 }
 
-.form-invalid input,
-.form-invalid input:focus,
-.form-invalid select,
-.form-invalid select:focus {
+.form-invalid .form-required,
+.form-invalid .form-required:focus,
+.form-invalid.form-required input,
+.form-invalid.form-required input:focus,
+.form-invalid.form-required select,
+.form-invalid.form-required select:focus {
 	border-color: #dc3232 !important;
 	box-shadow: 0 0 2px rgba(204, 0, 0, 0.8);
 }
Index: src/wp-admin/includes/nav-menu.php
===================================================================
--- src/wp-admin/includes/nav-menu.php	(revision 49223)
+++ src/wp-admin/includes/nav-menu.php	(working copy)
@@ -299,7 +299,7 @@
 		<input type="hidden" value="custom" name="menu-item[<?php echo $_nav_menu_placeholder; ?>][menu-item-type]" />
 		<p id="menu-item-url-wrap" class="wp-clearfix">
 			<label class="howto" for="custom-menu-item-url"><?php _e( 'URL' ); ?></label>
-			<input id="custom-menu-item-url" name="menu-item[<?php echo $_nav_menu_placeholder; ?>][menu-item-url]" type="text"<?php wp_nav_menu_disabled_check( $nav_menu_selected_id ); ?> class="code menu-item-textbox" placeholder="https://" />
+			<input id="custom-menu-item-url" name="menu-item[<?php echo $_nav_menu_placeholder; ?>][menu-item-url]" type="text"<?php wp_nav_menu_disabled_check( $nav_menu_selected_id ); ?> class="code menu-item-textbox form-required" placeholder="https://" />
 		</p>
 
 		<p id="menu-item-name-wrap" class="wp-clearfix">
Index: src/wp-admin/includes/template.php
===================================================================
--- src/wp-admin/includes/template.php	(revision 49223)
+++ src/wp-admin/includes/template.php	(working copy)
@@ -813,7 +813,7 @@
 	$cur_hh = current_time( 'H' );
 	$cur_mn = current_time( 'i' );
 
-	$month = '<label><span class="screen-reader-text">' . __( 'Month' ) . '</span><select ' . ( $multi ? '' : 'id="mm" ' ) . 'name="mm"' . $tab_index_attribute . ">\n";
+	$month = '<label><span class="screen-reader-text">' . __( 'Month' ) . '</span><select class="form-required" ' . ( $multi ? '' : 'id="mm" ' ) . 'name="mm"' . $tab_index_attribute . ">\n";
 	for ( $i = 1; $i < 13; $i = $i + 1 ) {
 		$monthnum  = zeroise( $i, 2 );
 		$monthtext = $wp_locale->get_month_abbrev( $wp_locale->get_month( $i ) );
@@ -823,10 +823,10 @@
 	}
 	$month .= '</select></label>';
 
-	$day    = '<label><span class="screen-reader-text">' . __( 'Day' ) . '</span><input type="text" ' . ( $multi ? '' : 'id="jj" ' ) . 'name="jj" value="' . $jj . '" size="2" maxlength="2"' . $tab_index_attribute . ' autocomplete="off" /></label>';
-	$year   = '<label><span class="screen-reader-text">' . __( 'Year' ) . '</span><input type="text" ' . ( $multi ? '' : 'id="aa" ' ) . 'name="aa" value="' . $aa . '" size="4" maxlength="4"' . $tab_index_attribute . ' autocomplete="off" /></label>';
-	$hour   = '<label><span class="screen-reader-text">' . __( 'Hour' ) . '</span><input type="text" ' . ( $multi ? '' : 'id="hh" ' ) . 'name="hh" value="' . $hh . '" size="2" maxlength="2"' . $tab_index_attribute . ' autocomplete="off" /></label>';
-	$minute = '<label><span class="screen-reader-text">' . __( 'Minute' ) . '</span><input type="text" ' . ( $multi ? '' : 'id="mn" ' ) . 'name="mn" value="' . $mn . '" size="2" maxlength="2"' . $tab_index_attribute . ' autocomplete="off" /></label>';
+	$day    = '<label><span class="screen-reader-text">' . __( 'Day' ) . '</span><input type="text" ' . ( $multi ? '' : 'id="jj" ' ) . 'name="jj" value="' . $jj . '" size="2" maxlength="2"' . $tab_index_attribute . ' autocomplete="off" class="form-required" /></label>';
+	$year   = '<label><span class="screen-reader-text">' . __( 'Year' ) . '</span><input type="text" ' . ( $multi ? '' : 'id="aa" ' ) . 'name="aa" value="' . $aa . '" size="4" maxlength="4"' . $tab_index_attribute . ' autocomplete="off" class="form-required" /></label>';
+	$hour   = '<label><span class="screen-reader-text">' . __( 'Hour' ) . '</span><input type="text" ' . ( $multi ? '' : 'id="hh" ' ) . 'name="hh" value="' . $hh . '" size="2" maxlength="2"' . $tab_index_attribute . ' autocomplete="off" class="form-required" /></label>';
+	$minute = '<label><span class="screen-reader-text">' . __( 'Minute' ) . '</span><input type="text" ' . ( $multi ? '' : 'id="mn" ' ) . 'name="mn" value="' . $mn . '" size="2" maxlength="2"' . $tab_index_attribute . ' autocomplete="off" class="form-required" /></label>';
 
 	echo '<div class="timestamp-wrap">';
 	/* translators: 1: Month, 2: Day, 3: Year, 4: Hour, 5: Minute. */
Index: src/wp-admin/nav-menus.php
===================================================================
--- src/wp-admin/nav-menus.php	(revision 49223)
+++ src/wp-admin/nav-menus.php	(working copy)
@@ -961,7 +961,7 @@
 					<div id="nav-menu-header">
 						<div class="major-publishing-actions wp-clearfix">
 							<label class="menu-name-label" for="menu-name"><?php _e( 'Menu Name' ); ?></label>
-							<input name="menu-name" id="menu-name" type="text" class="menu-name regular-text menu-item-textbox" <?php echo $menu_name_val . $menu_name_aria_desc; ?> />
+							<input name="menu-name" id="menu-name" type="text" class="menu-name regular-text menu-item-textbox form-required" required="required" <?php echo $menu_name_val . $menu_name_aria_desc; ?> />
 							<div class="publishing-action">
 								<?php submit_button( empty( $nav_menu_selected_id ) ? __( 'Create Menu' ) : __( 'Save Menu' ), 'primary large menu-save', 'save_menu', false, array( 'id' => 'save_menu_header' ) ); ?>
 							</div><!-- END .publishing-action -->