[DanBC]

> By now most developers are in the mindset that it's okay to let a page differ in some browsers as long as the difference is only minor/aesthetic and not a functional handicap.

Well, if they're writing standards compliant code it's fine if the page is different in different browsers, but I take your point that developers are happy to write non-standards compliant code to provide extra functionality for a few users.

> in the meantime developers need incentives to only use prefixed properties on test sites,

Maybe search engines need to provide boosts for standards-compliance and drops for standards-ignorance.