[zeven7]

This will never break. I still think it's a bad idea, but not for that reason. Browser vendors are strongly against ever making backwards incompatible changes - especially a change like this that would likely affect thousands of websites. Chrome is not going to suddenly make their HTML rendering engine more strict.

[chrismorgan]

Yeah, it’s certainly not fragile in that way. The quirks mode thing is actually one of my lesser concerns about it.