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privacytests.org
Source code for privacytests.org. Includes browser testing code and site rendering.
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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.
Brave does not have the same functionality as CleanURLs. If you scroll down the page on privacytests.org, you'll see something called document.referrer. That's what would clean urls and currently no browser has that capability. To test this, install the plugin and click the link to this post shared by u/UnseenGamer182 . With the plugin turned on, the url is cleaned. Without it, the url still has all of the utm parameters.