jQuery 4.0 trims browser support, removes APIs
Briefly

With jQuery 4.0, support is dropped for Internet Explorer versions 10 and older, Edge Legacy, Firefox versions before release 65, and iOS versions before release 11.
jQuery 4.0 adds support for Trusted Types, ensuring that HTML wrapped in TrustedHTML can be used as input to jQuery methods for manipulation in a way that does not violated the require-trusted-types-for Content Security Policy.
Read at InfoWorld
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