On hu.wiktionary the summary window hangs when clicking on preview. The traceback from the console seems to explain it pretty well:
This page is using the deprecated ResourceLoader module "jquery.ui.widget". load.php:31:942 This page is using the deprecated ResourceLoader module "jquery.ui.core". Please use OOUI instead. load.php:1:80 TypeError: $.Deferred.resolve is not a function[Learn More] load.php:668:454 ve.ui.MWSaveDialog.prototype.showPreview https://hu.wiktionary.org/w/load.php:668:454 ve.init.mw.ArticleTarget.prototype.onSaveDialogPreview/< https://hu.wiktionary.org/w/load.php:630:164 fire https://hu.wiktionary.org/w/load.php:46:599 fireWith https://hu.wiktionary.org/w/load.php:47:824 Deferred/</deferred[tuple[0]] https://hu.wiktionary.org/w/load.php:51:312 ajax/xhr< https://hu.wiktionary.org/w/load.php:501:398 fire https://hu.wiktionary.org/w/load.php:46:599 fireWith https://hu.wiktionary.org/w/load.php:47:824 done https://hu.wiktionary.org/w/load.php:126:165 callback/<