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wslg
Enabling the Windows Subsystem for Linux to include support for Wayland and X server related scenarios
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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.
If you use windows 11, you can skip that altogether now that WSL2 has built-in X11 and Wayland support. Even without that, I've found it much more reliable to use a framebuffer streaming protocol like VNC or RDP instead of a remote X client, which can be notoriously finicky.
the Playwright browser automation tool comes bundled with a cross-platform webkit build, so you can run it directly in windows. As other commentors have mentioned, it doesn't address weird quirks that show up in ios/macOS safari but not open-source webkit, but it gets you 95% there.