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Allows registering an unload listener

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PageSpeed find that on my website :

Allows registering an unload listener

The unload event does not fire reliably, and parsing it may prevent browser optimizations such as caching of previous and next pages. Use the pagehide or visibilitychange events instead. Learn more about offloading event listeners
Source https://www.internazionale.fr/uploads/javascript_global/root_library.js?v=950d8212841685401657


Is it "normal" ?

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