: It was the first version of IE to achieve a perfect or near-perfect score on the Acid3 test (reaching 100/100 after the test was revised) and introduced support for HTML5, CSS3, and SVG. System Requirements and Lifecycle
Internet Explorer 9 (IE9) was a major release in Microsoft's browser history, officially launched on March 14, 2011, during the South by Southwest (SXSW) festival . It marked a significant shift toward modern web standards and high-performance browsing. Core Technical Profile (32-bit)
: Interestingly, the 64-bit version of IE9 lacked this JIT compiler, making it up to four times slower than its 32-bit counterpart in JavaScript benchmarks. Internet Explorer 9 (32 bits)
IE9 introduced several features that brought it closer to competitors like Chrome and Firefox:
: Users could drag a website favicon to the Windows taskbar to "pin" it, allowing the site to function more like a standalone desktop application. : It was the first version of IE
While IE9 was available in both 32-bit and 64-bit editions, the 32-bit version was the default and generally recommended choice due to its superior performance at the time.
: Regular support for most versions of IE9 ended on January 12, 2016 , when Microsoft began requiring users to upgrade to the latest version of IE available for their OS. Core Technical Profile (32-bit) : Interestingly, the 64-bit
: The last regular security update was released on January 14, 2020 , though some versions on Windows Server 2008 remained eligible for Extended Security Updates (ESU) until early 2023.