I've seen a bunch of tweets like this recently, as far as I can tell they're all from people using https://aistudio.google.com/ who got served an A/B test.
https://x.com/cannn064/status/1973415142302830878 "Create a single, self-contained HTML5 file that mimics a macOS Sonoma-style desktop: translucent menu bar with live clock, magnifying dock, draggable/resizable windows, and a dynamic wallpaper. No external assets; use inline SVG for icons."
A few more in this genre:
https://x.com/cannn064/status/1973818263168852146 - "Make a SVG of a PlayStation 4 controller"
https://x.com/cannn064/status/1973415142302830878 "Create a single, self-contained HTML5 file that mimics a macOS Sonoma-style desktop: translucent menu bar with live clock, magnifying dock, draggable/resizable windows, and a dynamic wallpaper. No external assets; use inline SVG for icons."
https://x.com/synthwavedd/status/1973405539708056022 "Write full HTML, CSS and Javascript for a very realistic page on Apple's website for the new iPhone 18"
I've not seen it myself so I'm not sure how confident they are that it's Gemini 3.0.