[wamatt]

Love love love SingleFile too. The FF extension works pretty well for a clean save.

That said, Kage looks promising if OP can combine SingleFile reproduction quality with the HTTPTrack spidering approach. SPA's are kinda tricky with archiving and do wonder how well Kage would handle that

[initramfs]

I've seen the option in IE- .mhtml.

For some reason it displays in IE better but I don't recall seeing this option in chrome of Firefox recently..