ListExtender.js

https://www.julienbl.me/ListExtender/

Install

Static (recommended)

<script
  defer
  type="text/javascript"
  src="https://www.julienbl.me/ListExtender/lib/ListExtender.min.js"
></script>

Node

npm i list-extender

Getting Started

1. Create a ListExtender object

const myList = new ListExtender();

2. Append your list to some parent container in the DOM

myList.appendTo("#containerId");

And that's it! You now have a working extending list in your website!
From here you can customize the list however you see fit. A good place to start would be setting the placeholder and input type.

myList.setPlaceholder("Placeholder Text");
myList.setInputType("email");

For more instructions on using the library, visit:

https://julienbl.me/ListExtender/documentation.html