The CSS Paint API (css-tricks.com)

Really cool, a bit like shaders for CSS, but I can already imagine the debugging headaches!

I wonder if this will open the door to more timing attacks?

I think we're making CSS do too much. Next thing you know it will include a full fledged compiled language separate from JavaScript for implementing custom properties. Let's throw in a raytracer, too.

You can draw lines in this, you just need some way to apply styles to them ... some sort of style sheet ?

You know... What if we just forgot about CSS and just had a big paint() function for the entire page? :p