No-Library (pure JS), HTML, CSS, JavaScript
jQuery Compat (edge), HTML, CSS, JavaScript
jQuery 1.8.3, HTML, CSS, JavaScript
jQuery 1.10.1, HTML, CSS, JavaScript
Created this fiddle to provide an answer to this question on Stack Overflow: http://stackoverflow.com/questions/19152197/how-to-add-remove-and-add-button-with-lines-using-jquery