Yeah, I managed to hit the limit where it stopped being fractal. Damn these limited-precision floating point numbers!

No, it's because the maximum number of iterations is too low for that zoom level.

That won't cause it to be "blurry" -- that just causes it to be black. "Blurriness" is indeed due to floating-point errors in the coordinates system.

For me, in the browser, the edges just smooth out to a straight line, and seem blurry only because of the color scheme. In the desktop version, however, I see this when zoomed in maximally: http://i.imgur.com/ryhai.png.

This is what I maxed out at. It did start to look blurry right before it started lagging, and these staggered lines were revealed, but they look much different from yours. http://i.imgur.com/R5PbQ.jpg

Ah, fair enough. It's probably the iterations then.

After a while? Seems like it does it fairly quickly in both directions. Neat concept, though.