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Why can't we just have '-dev-' prefix which would mean "a feature implemented according to dev or working draft spec"?

When the spec changes, the updated feature could be implemented as '-dev-2-', '-dev-3-' and so on. W3C would just need to introduce consistent numbering scheme that could be followed by all vendors.

Vendor prefixes should be reserved only for features that are not standardized in any way.

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A lot of the time it's because the implementations haven't even been agreed between the different browsers.

I can't remember any specific examples off the top of my head but I do remember that some of the -webkit and -moz prefixes were ever so slightly different.

I think once it made it into the draft most browsers start supporting it using the standard css without any prefix.

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