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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 Pale Moon and struggle with some modern websites, you can enable more HTML5 features by installing the Palefill add-on as well as setting these properties to true in about:config: dom.animations-api.compositing.enabled dom.animations-api.getAnimations.enabled dom.animations-api.implicit-keyframes.enabled dom.animations-api.timelines.enabled dom.dialog_element.enabled dom.getRootNode.enabled dom.imagecapture.enabled dom.push.enabled dom.serviceWorkers.enabled dom.storageManager.enabled dom.webcomponents.enabled media.av1.enabled media.getusermedia.audiocapture.enabled media.mediasource.webm.enabled media.track.enabled media.webspeech.synth.enabled media.webvtt.regions.enabled Keep in mind that some of them are experimental (like ImageCapture) and may be unstable.