When you visit the Google’s chatbot bard’s website in Microsoft Bing. A New Button pops up besides the search bar which lets you compare bard results with Bing chat’s. I have no idea why they implemented this, well maybe to show off the their chatbot is better than bard or something?
Gemini exists and the protocol is designed to be hard to extend deliberately, but it serves documents as a markdown-like format instead of modern html/css/js