[pixelmonkey]

This is not about pre-form web. It's about pre-CORS web. Which is pretty recent web. CORS was "widely & properly" supported by "recently released" browsers around 2012-2013. Of course it's only as of very recently that you could safely assume 2010-2013 browser versions were completely out of circulation.

[082349872349872]

My bad; hadn't parent'ed enough, and the "using different methods than GET" clarification would not have been anachronistic even in the previous century.