You could say that Google Now on Tab has had an on-again-off-again relationship of sorts with the Android M developer preview. Back when version 5.3 of the Google app rolled out a few weeks ago, it enabled the functionality we saw detailed during Google I/O. If you tried to use Now on Tap a few days after that, it didn't work. Eventually you would see a pop up window saying, "Now on Tap is coming soon! Stay tuned..."

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