WEBVTT

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Why can a website remember a setting on this device?

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Browser storage can keep small pieces of site data locally.

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Understand the browser memory.
6 storage basics.

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Start with key and value pairs
Web Storage lets site scripts save simple named values.
Named key · Stored value · Site script access

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Local storage can persist
Data can remain when the browser is closed and reopened.
Return visit · Saved preference · Persistent local data

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Session storage follows the tab
It is separated by origin and tab, and ends when that tab closes.
Tab context · Same origin · Tab closes

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It is not automatically a backup
People can clear site data and storage may be unavailable.
Cleared browser data · Storage limits · Missing saved setting

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Keep sensitive data protected
Script-readable local storage is unsuitable for secrets.
No secret passwords · No sensitive records · Secure system design

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Test a fresh browser state
A site should handle missing preferences sensibly.
No saved data · Useful default · Records stored safely

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Your checklist
Start with key and value pairs · Local storage can persist · Session storage follows the tab · It is not automatically a backup · Keep sensitive data protected · Test a fresh browser state

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Keep local preferences separate from important records.
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