This puzzle used to require the use of Internet Explorer. In the text picture below, the text is written in a perfect checkerboard gray pattern. Internet Explorer used to use the exact opposite gray pattern to show selections, so if you selected the picture or chose 'Select All' the checkerboard would be overlaid on the image. To create the puzzle, I offset certain letters by one pixel which causes the effect below when you selected the bitmap.
So the effect used to look like this:
Sadly, new versions of Internet Explorer use a different technique for selecting bitmaps, so this cache puzzle technique doesn't work any more. But that's to your gain since now the puzzle is as easy as reading the numbers in that picture above. Enjoy!
You can check your answers for this puzzle on Geochecker.com.