Textarea overflow: (not set) and inherited computed values

Hi,

While investigating a few interoperability bugs in Internet Explorer we've root caused few to a difference in computed values for not set and inherited overflow values for textarea.

Consider the following example: http://jsfiddle.net/boggydigital/2sfc3/3/

There are at least four cases where three browsers report different computed values:

Textarea overflow: (not set)
Chrome: auto
Firefox: visible
IE: scroll

Textarea overflow: visible
Chrome: auto
Firefox: visible
IE: scroll

Textarea overflow:inherit with parent overflow: (not set)
Chrome: auto
Firefox: visible
IE: visible

Textarea overflow:inherit with parent overflow:visible
Chrome: auto
Firefox: visible
IE: visible

We would like to clarify and implement the expected interoperable behavior here.