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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.
The page can be added in my computer in any folder. I open the html file and it runs automatically, showing the price of a cryptocurrency which is pulled off one of the major exchanges.. The .js pulls the price live and it shows it on the screen, changing as the price changes. I assume this falls under the logic of an SPA. Nothing else is required in terms of authentication, logins, passwords etc. You open the .html file and it just runs in any computer or mobile device. It is based on the Slideshow Crypto Ticker script. I am not interested at all in controlling who visits the page as it doesn't contain any secrets.