MultipleIEs
MultipleIEs was a popular standalone application that allowed web developers to run multiple versions of Internet Explorer simultaneously on a single Windows machine, enabling testing across IE versions without maintaining separate computers. The tool became essential for developers who needed to ensure their websites worked across IE6, IE7, IE8, and later versions during the browser transition period.
Why MultipleIEs Matters
MultipleIEs and similar tools represented the web development community's response to Microsoft's fragmented browser ecosystem, where each IE version had different CSS bugs and JavaScript implementations. These testing tools became mandatory development resources, illustrating how browser incompatibility created an entire industry of workaround tools and testing methodologies that wouldn't have been necessary with consistent web standards.