Chrome: Deprecation - Unload event listeners are deprecated and will be removed

[myleads11]

Chrome is reporting that a deprecated api is being used: UnloadHandler. Chrome states that unload event listeners are deprecated and will be removed.

https://developer.chrome.com/docs/web-platform/deprecating-unload

The AJAX Control Toolkit

The installation method

• [X ] Installer AjaxControlToolkit.Installer.20.1.0
• [ ] NuGet package
• [ ] A custom build from the source code

Minimal steps to reproduce the bug

I believe most any website that uses the AjaxControlToolkit will see this deprecation warning in the console of the chrome developer tools. I attached a screen shot. Please let me know if any other information is needed.

Actual result

Expected result

Browser(s) used

Chrome Version 125.0.6422.77 (Official Build) (64-bit)

A site deployment method

• [ ] VS development web-server,
• [X ] IIS