JSFiddle - React, Tailwind, and code Playground
HTML
<!doctype html>
<form>
Name: <input><br>
Password: <input type=password><br>
<login-extras tabindex=-1></login-extras><br>
<input type=submit value="login"><br>
</form>JavaScript
document.createElement('login-extras');
document.querySelector('login-extras').createShadowRoot().innerHTML="<input type=checkbox>save cookie |<a href='http://example.com/help'>help</a>";