To develop and test features specifically for build 9600.16428 :
Always provide a static fallback value for CSS variables. For example: Use code with caution. Copied to clipboard 3. Emulation and Testing internet-explorer-11-0-9600-16428-final-kuyhaa
If you are working on a project that must support this specific legacy environment, here are the most effective ways to "develop features" for it: 1. Feature Detection and Polyfills To develop and test features specifically for build 9600
IE11 does not support (Custom Properties) or CSS Grid (it uses an older, prefixed version). Emulation and Testing If you are working on
Microsoft previously offered free Virtual Machine images for testing legacy IE versions, which can still be found in various archives for legacy support testing. 4. Important Security Warning
Use this compiler to transpile modern JavaScript (ES6+) into ES5 code that IE11 can execute. 2. CSS Compatibility