Initially: Unidirectional data transfer (server sends page to browser)
Increasingly: WWW as a single application with many components:
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Increase in data transfers among servers, proxies, and clients
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Increase of cases where non-ASCII characters are allowed (due to Unicode/ISO
10646!)
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Increase in data transfers between different protocol/format elements (such
as element/attribute names, URI components, and textual content)
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Definition of specifications for APIs (e.g.
DOM)