[o11c]

Hmm, the disadvantage of your approach is that it unconditionally requires Javascript, even if the original didn't.

Also if you're going to embed a giant binary blob, please ship way to extract it.

[3rd3]

Aren't the image blobs embedded in the URLs using Base64-encoded strings rather than using JS?

[mr_mitm]

Yes, it's a trade-off.

Not a bad idea, thanks for the suggestion.