This is awesome. One question though: how does it handle the same resource (e.g. image) appearing multiple times? Does it store multiple copies, potentially blowing up the file size? If not, how does it link to them in a single HTML file? If or if so, is there any way to get around it without using MHTML (or have you considered using MHTML in that case)?

Also, side-question about Rust: how do I get rid of absolute file paths in the executable to avoid information leakage? I feel like I partially figured this out at some point, but I forget.