You could do that, but that's not what the page is doing. You don't even need to maintain the approach of having the pattern within the text move downwards ove

You could do that, but that's not what the page is doing. You don't even need to maintain the approach of having the pattern within the text move downwards over time. You could redraw it every frame with random data, as if it was television static. It would still be easy to read, as long as the background stayed fixed.