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I had no idea it did that! Thanks for letting me know. Will look into.

Smooth scroll here. Windows 10/Chrome59.

Not being well-versed in such matters, I'd appreciate any insight you can offer into why the Nav hijacking happens and what I might do about it.

I created the article using a WP plugin (Aesop Story Builder) which integrates with the WP theme I'm using (Journalist from UpThemes).

Oh. I looked into it a bit, looks like that's something "Aesop Story Builder" does. Not sure if they have settings that you can control through their interface. If they do, it looks like the relevant option might be called "arrowKeys".

Agreed. pg up/pg dn takes me to top of page/end of article in Chrome on a MBP

Try space and shift-space.