Wikimedia Bugzilla is closed!

STEPS:
0. Use Mozilla Firefox 27 or Google Chrome 33
1. Go to http://korma.wmflabs.org/browser/bugzilla_response_time.html
2. Zoom in (Ctrl++) or zoom out (Ctrl+-)

RESULTS:
The x axis (time) changes and more recent values are not displayed anymore. 
If you do this often enough, no data is displayed at all anymore.

INCENTIVE:
Originally I was wondering whether I could somehow zoom into more recent values, e.g. I don't want to see 2004-2014 but only 2012-2014 or such. If this is already possible, then it's not obvious to me how. :)

(I'm used to marking an area via clicking the left mouse button and dragging in order to mark the x axis part, like in audio editing applications, but that would be a different enhancement request.)