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https://medium.com/daniiable-in-the-workplace/como-hacer-un-login-con-javascript-y-html-sencillo-aff1dab6a6bf
http://www.forosdelweb.com/f13/validacion-sencilla-formulario-login-con-javascript-1071397/
https://es.stackoverflow.com/questions/136249/validar-login-con-javascript-y-asp-net
https://www.lawebdelprogramador.com/foros/JavaScript/1355165-Validar-contrasena-y-usuario.html
http://idesweb.es/proyecto/proyecto-prac05-js-validacion
https://huguidugui.wordpress.com/2013/10/08/login-y-registro-validar-con-jquery-cliente/
http://www.chw.net/foro/webmasters/1258237-logueo-usuarios-y-validacion-ajax-y-json.html
https://uniwebsidad.com/libros/javascript/capitulo-7/validacion
https://desarrolloweb.com/articulos/1767.php
https://developer.mozilla.org/es/docs/Learn/HTML/Forms/Validacion_formulario_datos
http://lineadecodigo.com/javascript/validar-password-con-javascript/
https://foro.elhacker.net/dudas_generales/duda_en_html_iquestcomo_validar_usuario_y_contrasena_al_mismo_tiempo-t397269.0.html
https://webkode.es/validacion-de-campos-de-formulario-con-javascript/