How? It should just zoom the viewport, there's no reason for any of the DOM elements to even be aware that it's happening. Or has this been implemented in a really stupid way?
Would love to hear from someone who's actually familiar with what's going on though.
[0] http://updates.html5rocks.com/2012/09/Stacking-Changes-Comin...
[1] https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Under...