Ticket #59387: patch.diff

src/wp-includes/kses.php

@@ -2470 +2470 @@
                         'z-index',
                         'box-shadow',
                         'aspect-ratio',
+                        'writing-mode',
 
                         // Custom CSS properties.
                         '--*',

tests/phpunit/tests/kses.php

@@ -1341 +1341 @@
                                 'css'      => 'grid-template-columns: repeat(4, unsupported(0, 1fr)',
                                 'expected' => '',
                         ),
+                        // Wiritng mode introduced in 6.4.
+                        array(
+                                'css'      => 'writing-mode: vertical-rl',
+                                'expected' => 'writing-mode: vertical-rl',
+                        ),
                 );
         }