[f0xtrot]

I'm not sure about a button for view source in any of them.

view-source: appears to still work in chrome mobile (Firefox works too), not sure about safari.

Nope, view-source: does not work on ddg. which seems odd since it looks like it's built on top of chrome. URL's seem like they're parsed oddly.

I have yet to find a way to view source on ddg :(