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To enable flutter web, you have to set up your Flutter CLI properly, and after that, you have to make sure you are on the right channel. Today when I write this post, Flutter web is still in beta, so we have to select a branch that supports beta features. >> flutter channel Flutter channels: * master dev * beta stable The master channel is the current tip of development. It contains the newest changes in the framework but it is also vulnerable to breaking changes. So that means in the worst case something is going wrong. The beta channel is a code selection of the flutter team once a month to a branch that contains the newest released features. It is selected and more stable. So if you want to try around, this would be the channel to go. ...