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IETester

IETester was a free application that allowed web developers to test websites in multiple versions of Internet Explorer (IE6, IE7, IE8, and later versions) within a single interface, providing tabs for each IE version to compare rendering differences. IETester became essential for developers dealing with IE's inconsistent behavior across versions during the browser transition period.

Why IETester Matters

IETester and similar tools represented the web development community's response to Microsoft's fragmented browser ecosystem, where each IE version had different bugs and capabilities that required separate testing. These tools became mandatory for professional web development, illustrating the hidden costs of browser incompatibility and the industry-wide effort required to work around a single vendor's inconsistent implementations.

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