We had Ajax, lots of modern CSS, but weren't hell-bent on CSSifying and "SPA"-ing everything. Web standards hadn't yet jumped the shark.
It's also before Steve Jobs murdered Flash.
Killing Flash was one of the biggest mistakes we've made. The modern HTML/CSS/JS stack can't replicate how simple and functional it was. We're easily dealing with 100x the complexity now.
We let Google trick us into going down this path. And now they're going to kill the web to keep us on their LLMs and platforms.