As a graphic designer, I loved having a utility that would give me a magnifying glass and tell me the exact color of a given pixel, in RGB or hex. It was oh so very useful, but now I want more.

What I dream of, as do so many people who have to make pixel-perfect HTML, whether they know it or not, is a PixelSpy that tells me not just the color, but the rationale behind a pixel. I want to point at a pixel on a web page and tell me, layer by layer, what objects are there, with easy shortcuts to the cascaded style info for that object, with the ability to click on any one of those properties, like font size, color, or what have you, and show me the tree of cascading factors that made it end up at that value.

I want to be able to click on a 1-pixel border that shouldn't be there and instantly know what piece of code makes the browser think it should be there.

It would save hours. Like now.