When HTML was introduced in the early 1990s, the only semblance of interactivity it gave the user was the hyperlink — with a single click you could leap to any other page on the fledgling web. While hypertext certainly changed our perspective of self-contained linear text documents, all you could do really was jump around.

In 1995, HTML 2.0 introduced forms and suddenly the web became interactive. Forms enabled e-commerce, adding profit-motive fuel to the fire of self-expression, and incredibly accelerating the growth of the web. The addition of a small number of user interface elements (eight types of ...

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