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<!DOCTYPE html> <html> <head> <title>Title of the Document</title> </head> <body> <button data-toggle-id="mail-id"> Show the form </button> <form id="mail-id" hidden> Your mail: <input type="email"> </form> <script> document.addEventListener('click', function(event) { let id = event.target.dataset.toggleId; if(!id) return; let elem = document.getElementById(id); elem.hidden = !elem.hidden; }); </script> </body> </html>