Computer Science / CS 0544 · Atom · ~20 seconds
Web 1.0, Then 2.0
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State
The Web's first phase limited users mostly to reading and selecting pages; the second added interactivity — which meant maintaining state, heavier servers, and a clean separation of rendition, business logic, and data.
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A read-only bulletin becoming a store with a cart is the transition in one site.
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Interactivity's price was complexity, paid server-side first.