Why to use DOMContentLoaded event When Retrieving Data from localStorage in Javascript

JavaScript
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I recently started to learn how to use localStorage and I have watched many tutorials and read different Blogs want to know how to get data from localStorage. They all use document.addEventListener(‘DOMContentLoaded’) to retrieve data from localStorage And I have searched on google on what DOMContentLoaded event does and I have found that it is used to do some actions when the whole document has been completely loaded (and this is understandable).

My Question comes to be, Why do we need to wait for the Whole document to load when retrieving data From localStorage ???

Best Regards!!!

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