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lottie-web
Render After Effects animations natively on Web, Android and iOS, and React Native. http://airbnb.io/lottie/
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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.
Apparently what the Synfig project recommends nowadays is to export for web (Lottie). And from there, you must use another software (from a series of software called Lottie, Open Source too) to render for a given platform. The one to export your lottie file to animated SVG would likely be lottie-web. The README says there is a SVG renderer.