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BTW, This is the greatest sample tutorial I've ever seen in my ~38 years of computer life. Select Button, for instance, and then the three icons top-right and the tabs under each icon. Especially → Description | Source is really sexy!
P.S.: The image resizing not working here is a bit less sexy. :(
P.P.S.: <img alt="(i)" src="https://upload.wikimedia.org/wikipedia/commons/thumb/1/18/Circle-information.svg/225px-Circle-information.svg.png" height="16" width="16"> doesn't work either. x-(