https://github.com/jquery/jquery-migrate/tree/1.x-stable#readme
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jquery-migrate: Migrate older jQuery code to jQuery 1.9+
This plugin can be used to detect and restore APIs or features that have been deprecated in jQuery and removed as of version 1.9.
See the warnings page for more information regarding messages the plugin generates.
For more information about the changes made in jQuery 1.9, see the upgrade guide and blog post.

In your web page, load this plugin after the script for jQuery:

<script src="https://code.jquery.com/jquery-1.9.1.js"></script>
<script src="https://code.jquery.com/jquery-migrate-1.4.1.js"></script>

<script src="https://code.jquery.com/jquery-1.9.1.min.js"></script>
<script src="https://code.jquery.com/jquery-migrate-1.4.1.min.js"></script>

<script src="https://code.jquery.com/jquery-1.12.4.js"></script>
<script src="https://code.jquery.com/jquery-migrate-1.4.1.js"></script>

<script src="https://code.jquery.com/jquery-1.12.4.min.js"></script>
<script src="https://code.jquery.com/jquery-migrate-1.4.1.min.js"></script>

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Note that jQuery 3.0 has a separate version of jQuery Migrate.
The two versions cannot be used simultaneously on a page,
so you should fix any upgrade issues identified by Migrate 1.x before attempting an upgrade.

<script src="https://code.jquery.com/jquery-3.1.0.js"></script>
<script src="https://code.jquery.com/jquery-migrate-3.4.1.js"></script>

<script src="https://code.jquery.com/jquery-3.1.0.min.js"></script>
<script src="https://code.jquery.com/jquery-migrate-3.4.1.min.js"></script>

<script src="https://code.jquery.com/jquery-3.6.3.js"></script>
<script src="https://code.jquery.com/jquery-migrate-3.4.1.js"></script>

<script src="https://code.jquery.com/jquery-3.6.3.min.js"></script>
<script src="https://code.jquery.com/jquery-migrate-3.4.1.min.js"></script>

