Should I measure non-reflow zoom in Safari?

[yonran]

Safari 5.1 has three notions of zooming

1. Discrete full-page zoom (Cmd++)
2. Discrete text-only zoom (Cmd++) with the setting “Zoom Text Only” enabled
3. Continuous pinch zoom using trackpad. This is like the iPhone: it does not cause layout to happen again.

Currently, I only measure the first kind of zoom. Would it be useful to try to measure the text-only zoom or the non-reflow zoom?

[squiddle]

+1 it would be great to have a detection for the pinch zoom.