Just because it's too ambitious doesn't mean it's impossible.
WebGL is a sweet little innovation that brings the wonders of 3D to your browser. But just like any other 3D software, it depends on your graphics capabilities -- if it doesn't support OpenGL well enough, then WebGL will be difficult. But it's still entirely possible to have Chrono Cross ported as a Web Application!
Here's an example for a FPS:
https://developer.cdn.mozilla.net/media/uploads/demos/a/z/azakai/3baf4ad7e600cbda06ec46efec5ec3b8/bananabread_1348775105_demo_package/game.html?low,lowNote: Not every browser supported will display WebGL on every computer, because as I said some graphics card aren't supported, and hence blacklisted. Even the latest Firefox on my netbook didn't display it, because Firefox blocks it (and for a good reason), and all I saw was a grey box.
To fix this (if only temporarily to view utunnel's toy), on Firefox type "about:config", then search for "WebGL" and double-click "webgl.force-enabled" to make the value "True". But it's always good to revert the changes.