Is localStorage Data Isolated Between Different Pages and Domains in HTML5?

Inter-page Isolation of localStorage in HTML5:

In HTML5, the localStorage object provides a mechanism for storing data locally within a web browser. One important consideration is whether this data is isolated between different pages and domains.

Answer:

The localStorage object in HTML5 is isolated based on domain and port. This follows the same segregation rules as the same-origin policy. This means that each domain and port combination has its own separate localStorage object, preventing data from one page or domain from being accessed by another.

Implications for Key Naming:

Since localStorage is isolated by domain, it is not necessary to prefix keys with any specific domain-based identifier. You can name your keys whatever you want, as each domain will have its own separate set of keys.

Per-page Isolation:

If you require per-page isolation, you can implement it yourself by using a key that includes the location of the page, such as the pathname.

Additional Note:

While it is not required to prefix key names, it can be considered a good practice for readability and organization, especially if you have multiple domains and/or pages involved.

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