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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.
It does have crossover, doesn't it?
There's a GitHub link at the bottom which gives us this:
https://github.com/red42/HTML5_Genetic_Cars/blob/master/src/...
And that seems to call into createCrossBreed() in here:
https://github.com/red42/HTML5_Genetic_Cars/blob/master/src/...
And that gets a parentChooser callback, which seems to be cw_chooserParent() from here:
https://github.com/red42/HTML5_Genetic_Cars/blob/master/src/...
And that has some swap points and a thing that toggles between parents when some index matches one of two values.
I'm not really a JS programmer or a GA expert, but it looks like crossover to me.