`action="."` strips query parameters from the URL which is not usually what
you want. Copy-paste coding of these examples could lead to difficult to
track down bugs or even data loss if the query parameter was meant to alter
the scope of a form's POST request.
Backport of 77974a684a2e874bccd8bd9e0939ddcb367a8ed2 from master
jQuery cookie is no longer maintained in favor of the JavaScript
cookie library. This also removes the jQuery dependency.
Backport of f9de1972685ab5ab31ce483a297d85d3e119088b from master
