Why rivals Google and Apple agree on HTML5
tech.fortune.cnn.com
tech.fortune.cnn.com
So, all agree in HTML5, they all support it, because they all need it.
(Edit: actually, it probably wasn't scary to any OS vendor but MS; the others were all happy to think that users might move to applications that could run on their OSes, too.)
At least "AJAX" was a new term, not one with an actual meaning that was co-opted for a different use.