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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Another possible aspect he could have meant is that there are some frameworks for BSV that just stash a bunch of javascript code in BSV transactions. Whoever consumes those transactions is expected to run that javascript code to put back together some state. It's what cryptofights is using, in a way that generated a silly number of transactions at one point. You can read about it at https://run.network/ for now, although the folks behind it are moving on, so it's unclear what future it will have. As I understand it, the Run sdk is not intended to run in a browser, but in a node.js environment (and all the state stashed in transactions needs to also be stored in a local database for anything non-trivial to work properly.) Still it's all javascript anyway.