/usr/share/javascript/jquery-ui/ui/tabbable.min.js is in libjs-jquery-ui 1.12.1+dfsg-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | !function(factory){"function"==typeof define&&define.amd?define(["jquery","./version","./focusable"],factory):factory(jQuery)}(function($){return $.extend($.expr[":"],{tabbable:function(element){var tabIndex=$.attr(element,"tabindex"),hasTabindex=null!=tabIndex;return(!hasTabindex||tabIndex>=0)&&$.ui.focusable(element,hasTabindex)}})});
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