SVG in HTML5: overflow

In experimenting with the use cases aroung SVG in HTML5 the vast majority of our 'web developers' internally expect that the SVG embedded inline in HTML be overflow: visible by default to be more like other HTML elements (such as DIVs).  

Try the 'falling balls' demo at http://ie.microsoft.com/testdrive/ with IE9.

We want to be interoperable, but we think this is the expected behavior from web devs.