No-Library (pure JS), HTML, CSS, JavaScript
https://gist.github.com/staltz/868e7e9bc2a7b8c1f754?fbclid=IwAR3CuI5ZVfOqgcgEPUIQmxRr0Xt3rZxk0l9LL1Jo0G9tCu0Lkb3AQ09jEuA http://egloos.zum.com/aretias/v/970593 https://github.com/jquery-i18n-properties/jquery-i18n-properties https://github.com/jquery-i18n-properties/jquery-i18n-properties/wiki https://dzone.com/articles/internationalization-using
jQuery 1.9.1, HTML, CSS, JavaScript
Mootools 1.3.2, HTML, CSS, JavaScript
https://hiddedevries.nl/en/blog/2017-01-29-using-javascript-to-trap-focus-in-an-element