I remember seeing a very similar effect on my iPhone 3G with Safari. Since it only ever happened on Hacker News, I'd personally place the blame on the HTML here, rather than the browsers. When it works I prefer this rendering, I couldn't figure out what was different at first, I assumed it was just better tuned to my Galaxy Nexus screen size/dpi.
Also, one of the other features is a zoom window when you try and click on small link targets that are close together. Not tried it here yet but it worked beautifully on the similar up/down vote arrows on Reddit. (image showing it in action: http://i.imgur.com/UpWKF.jpg)
Also, one of the other features is a zoom window when you try and click on small link targets that are close together. Not tried it here yet but it worked beautifully on the similar up/down vote arrows on Reddit. (image showing it in action: http://i.imgur.com/UpWKF.jpg)