A while ago (doesn't really matter how long since this is going to take so long to write) a relative showed this website, which was posted (but not created) by a relative. Before you continue reading, go ahead and play around with it. I suck at chess so I can never beat it, and chances are that you will have a hard time, too. This seems fine and dandy, nothing wrong here. Plenty of sites like this exist, lichess, chess.com, sparkchess etc. It really gets interesting once you use the inspect tool.
See if you can figure out where the chess engine or decision-making process is. Can't find it? Use the network tool to make sure that it is not importing another file. Now, view the actual source. This is what I see (might be updated by the time that you see it):
<!doctype html>
<body>
<script>