[softgrow]

An inline svg in the parent page would trim it down to 87 bytes and replace <img> code, so even less than 87 in practice.

<svg width="256" height="256"><rect width="100%" height="100%" fill="#aad3df" /></svg>

[willis936]

That looks like a very low entropy series of bytes to me.

[billpg]

That string gzips to 82 bytes. I thought it would be a lot smaller.