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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.
I thought it was really interesting that Safari on iOS apparently has some support for this API. Usually Safari is far behind the other vendors in support for this sort of stuff, but they even beat mobile Chrome.
Personally, I'm really excited for this API or something equivalent to be standardized. It will really expand what is possible to do in the browser. For example, I wrote a plugin that lets TiddlyWiki autosave to disk https://github.com/slaymaker1907/TW5-browser-nativesaver.