JSFiddle - React, Tailwind, and code Playground
HTML
<form method="POST" action="https://beta.familysearch.org/tree/sources/sourceCA?personId=L4QF-TJ9&mode=import">
Title: <input type="text" name="title" value="1940 US Census"><br>
URL: <input type="text" name="url" value="http://findmypast.com/records/us_cencus"><br>
Citation: <input type="text" name="citation" value="My grandfather in the US 1940 Census"><br>
Notes: <input type="text" name="notes" value="This is a great find."><br>
<p><input type="submit" value="Attach to Family Tree"></p>
</form>