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If you were able to run a copy of Safari version 48, it would probably look like a Gecko-based browser before this date.

v38. You'd not see it with v48.

My mistake. We turned it off in the final release?

Yup!

But he seems to be saying that the code that enables this is still in Safari.

I suggest you look at the author of the comment to which you replied, and compare his name to the author of the article…