Sometimes, when I am scrolling, areas of text briefly become highlighted in yellow.  The yellow highlighting then quickly fades away (fades, not suddenly disappears).

I cannot deliberately reproduce this behaviour, and I cannot figure out what the point of it could be.  Does anybody know what is going on?

I have not been using Chrome that much, as I am waiting until the Google Toolbar features are included, which I am sure will be the case quite soon.  I have been using it on sites that are just too slow with IE7, like The Huffington Post.

So, it is only on The Huffington Post main page that I have noticed this happening, so far.  I am also using a ThinkPad laptop with a TrackPoint (not TrackPad) which has middle button scrolling.  I have added this information, just in case that it is some sort of bug that only happens with this setup.

Can anybody reproduce this behaviour, or know what is happening?

Cheers