Compose Multiplatform supports all modern platforms for writing applications. To achieve this, we at JetBrains devote a lot of time and attention to deep integration with each platform. Every platform has its own unique challenges. In this talk, I want to focus on how I supported several features on the web target. What problems and peculiarities I encountered, and how I solved them. How the same problems were solved in other frameworks. And why there is not just one web target, but not even three, but six, if not more!