How to open a database in javascript?

Question

I recently viewed a video in which they created a database in a js file using the function openDatabase(),
but it didn't work with me. why?
https://youtu.be/aJuGNkCetUE

Answer 1

Web SQL is obsolated. Use IndexedDb for client database.

Learn more from https://developers.google.com/web/ilt/pwa/working-with-indexeddb

Answer 2

Calviղ thank you for answering my question but I'd like to know the problem. That's all!

Answer 3

Obsoleted code means it does not work on some of the new browsers.