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You need HTML5/webgl support to run the page, came standard on my machine/browser, so you should be good.

http://khyperia.com/projects/mandelbrot/

Drag the mouse to pan, and scroll to zoom. I heard rumors of firefox not supporting the mouse scroll event, but I don't know, didn't test it on firefox.

Made this as a "hello world" type webgl project in about 3 hours. Yeah, simple algorithm is simple, color is just the sin of iteration count over some Fibonacci numbers. The point is that its realtime, and in a browser, not looks cool.

And then I realized I called it "mandelbox" because I type in mandelbox a LOT more than mandelbrot. Fail.

Edit: Updated URL to reflect what's actually displayed, and added buttons for Firefox users.

Cool.
The mousewheel zoom is a little slow for my preference.
I saved the link to my Harddrive and altered the onMouseWheel function to divide by 1000 rather than 10000
ie.

        function onMouseWheel(event) {
            var wheelData = event.wheelDelta;
            zoom *= Math.exp(-wheelData / 1000.0);
        }

I don't know much about Javascript and even less about WebGL.
Is the GPU doing the calculation through OpenGL?
The first script "shader-fs" would be the WebGL not javascript?

yepp, firefox doesn't scroll...

Lol too bad hat fireo dlol too bad that firefox doesnt support wheelie events but since it is just 2d ican live with it, well done anyways

Yeah, pretty sure its OpenGl, and yep, all calculations are done on the GPU, recalculating every single pixel in the frame 10 times a second. The shader-fs is the pixel/fragment shader, and shader-vs is the vertex shader. Oh, and WebStorm dosn't support webgl, so that's why theres no formatting in the shaders.