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Re:Show HN: “OK Google” – Explore Google Now voice commands by Klathmon on Wednesday June 29, 2016 @10:57AM (#12002005)
That's because the author set the css property `user-select` to `none`.

Why? I'm not sure, but that has nothing to do with any of the libraries listed, or even javascript at all.

Re:Show HN: “OK Google” – Explore Google Now voice commands by chain18 on Wednesday June 29, 2016 @05:07PM (#12004827)
I assume it is because you can click on the commands to cycle through the examples. If you didn't have this css property set you would end up selecting text.