I am developing a User Interface with SVG and JavaScript.
I am testing on Mac with Safari, Firefox 3.16 and 4b9, Opera 11, and Chrome

I am using groups <g> and <use> to allow me to drag several elements.
I am using a variation of this: 
http://www.codedread.com/blog/archives/2005/12/21/how-to-enable-dragging-in-svg/

When I drag <g> or <use> graphic elements involving path, it is fine.
When I add text+tspan behaviour of the browsers diverge.

Safari and Opera 11, both continue to work fine.
Chrome draws a 'flickering' text highlight on the elements which are earlier in 
the document
Firefox often (but not always) creates a text 'drag rectangle' and when 
mouse-up, the rectangle disappears, and the dragged 'use' elements 'jump' to 
the cursor. So the whole set of events are propagated, but after the button is 
released, and the mouse-up is lost, which is very awkward.

So, my requests are:
1. would someone point me at the documents which explains the correct/expected  
behaviour?
2. I want to drag paths, with text on top, so is there a single approach will 
works with the (existing) main (Mac) browsers?

(I can post an example if folks would like to see what I am describing)



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