Modern websites feel stateful, personalized, and intelligent. You log in once and remain authenticated. Your theme preferences is remembered. You shopping cart survives page reloads. Some apps even work offline.
But underneath all of this lies a fundamental truth:
The web was built on a stateless protocol.
This chapter explains why browser storage exists at all, why multiple storage mechanisms were necessary, and how the evolution of the web forced browsers to become much more than document viewers.
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