That's a surprise to see pop up again! Author here. Now I wish I had improved the demo in the past years... It still generates the etag from a few static parameters to make it work without JavaScript (as the page notes near the bottom), a real implementation doesn't have that limitation because they don't care to echo data (such as your note and visit count) back to you before the image with etag even loaded. I should have switched it to display the data in the image, so it works more accurately.