!!! Overview
[{$pagename}] is part of [Web Storage]  and maintains a separate [Web Storage] area for each given origin that's available for the duration of the page [session] (as long as the [browser] is open, including page reloads and restores).

[{$pagename}] are simple [key-value] [DataStores], similar to objects, but they stay intact through page loads. 

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]
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* [#1] - [Using the Web Storage API|https://developer.mozilla.org/en-US/docs/Web/API/Web_Storage_API/Using_the_Web_Storage_API|target='_blank'] - based on information obtained 2018-12-16-