Thanks for the analysis on what's going on with Chromium in regards to Raspbian. Seems like I'm riding the wrong horse
I was actually looking at Epiphany yesterday before I decided to make my first post, and I was a little disappointed by what I found. It's totally possible that Epiphany is a legitimate and good browser, but I couldn't find anything about getting it into kiosk mode (people actually suggested using Chromium instead for this purpose). Also, I couldn't find info about whether Epiphany is compliant with CSS3. Furthermore, it is not obvious to me whether Epiphany is going to be supported long-term or not.
Do you know more about Epiphany? Can you point me towards some better resources?
After looking at your referred post, looks like I should look into Minimal Kiosk Browser as well (still the question about long-term support, though). I can't find anything about CSS3 compliance, though. I would love to see something like caniuse.com for these two browsers...