<! DOCTYPE html > < html > < head > < title > JavaScript Firebase Tutorial - How to Read and Write Data </ title > < link rel = "stylesheet" href = "https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css" > < script src = "https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js" ></ script > < script src = "https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js" ></ script > </ head > < body > < h2 style = " text-align: center; " class = "text text-success" > JavaScript Firebase Tutorial - How to Read and Write Data </ h2 > < div class = "container" > < div class = "col-sm-6" style = " border: 1px solid gray; border-radius: 8px; " > < h2 > Reg. Form </ h2 > < form action = "#...