[support] Re-sizable form text area

I only today noticed the resizable textareas in Drupal.org account information forms.

Does anyone know what combination of js/css is at work here? Or have a link to download resources needed to implement this feature?

-- Gary

(In general, why are web form fields always so small, anyway? I particularly wish that the _width_ could be quickly increased.)

(Drupal and CivicSpace both give so little room to editing fields. I would like to increase the size of the content creation form boxes site-wide, in one fell-swoop. Am I going to need to do this piece-meal, across loads of files, or is there some 'magic' setting that I've missed that would allow me to increase editing box sizes site-wide?)