blueisland

I have a very simple dropdown box for two language selection (EN/FR) which I got from W3Schools. It works fine but what I want is that when the language is selected it becomes the default choice for visitors unless they choose otherwise. I assume this must involve a cookie but how do I code for this? I am using straight html, no CMS. Is it possible? Thanks for any help <div class="dropdown"> <button class="dropbtn">EN</button> <div class="dropdown-content"> <a href="https://websitename/fr/page.html">Français</a> </div></div>