This is a heavily interactive web application, and JavaScript is required. Simple HTML interfaces are possible, but that is not what this is.
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Frontend Masters
frontendmasters.com
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Quick Dark Mode Toggles
All the browsers DevTools have a way of emulating color modes. The are essentially faking the system preference at the application level. Here's where those controls are located and another nice tool.
https://frontendmasters.com/blog/quick-dark-mode-toggles
2025-08-23T07:39:03.509Z