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That is not what I see in my Firefox:

It is probably some kind of weird configuration in my computer though.

You hit an arrow key. This page has weird scripting that tries to let you navigate with arrow keys, but I noticed it ends up skipping most of the text that way.

I'm guessing they used this document as their 'slides' while presenting. The text is what they'd be saying, while the arrow keys hide the script, and flip between annotated graphics.

That said, the keyboard navigation is pretty much useless outside of that context.

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