For example, such as the Backward Compatibility system on PlayStation 3 game consoles, besides being able to play PlayStation 3 games, PS3 game consoles can still play games from PlayStation 2. That's an example.
Of course it will be better if there is no old code in your blog template and you don't need to install the code that I will share.
How to Install jQuery Migrate on Blogger
For friends who add old code and still want to retain the code but want to use the current jQuery library, you can install the jQuery Migrate code below before </ head> on your template.
<script src='https://cdnjs.cloudflare.com/ajax/libs/jquery-migrate/3.0.1/jquery-migrate.min.js'/>Okay, how about posting How to Install jQuery Migrate on Blogger. Hopefully useful and welcome.