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UnloadHandler and Deprecated APIs that will eventually be removed from the browser


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PageSpeed Insights is now making a big deal out of the use of UnloadHandler and "Registers an unload listener" in root_library.js. My scoring for Best Practices went from ~95 to ~78 overnight. Are you aware of this, and if so, what is the timeframe for updating this?

 

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Apparently it will not be supported by browsers for much longer, so you may want to put this on your front burner. Since it is showing up now in PageSpeed Insights with a much higher penalty than before, it has also become a bigger negative ranking factor.

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