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Playwright
Playwright is a framework for Web Testing and Automation. It allows testing Chromium, Firefox and WebKit with a single API.
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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.
We've been playing with leveraging something like Playwright to show content in emulated devices using other rendering engines, but the overhead is quite high as of now.
I've published an explainer on GitHub that covers possible scenarios and will get more design ideas soon and we have an Issue on GitHub tracking the progress. I would love to hear more what you think would be a better experience than what we have right now.