RE: smooth scrolling defined

Specifically I suggest the note should be at the end of section 9.3.2
For example:

The result of performing the processing described above will be a sequence of N intermediate synchronic document instances, DOCinter0… DOCinterN−1.


Note:

Where an implementation is able to detect significant similarity between two adjacent synchronic document instances, DOCinterN-1… DOCinterN; such as for example the removal of the top line of the content flowed into a region causing the appearance of scrolling, then the implementation should attempt to make the transition between presenting the two instances as smooth as possible, e.g. following CEA-608-E, Section C.3

From: Michael A Dolan [mailto:mdolan@newtbt.com]
Sent: 31 May 2012 08:30
To: public-tt@w3.org
Subject: smooth scrolling defined

I recommend we add a note/recommendation that presentation engines implement “smooth scrolling” for regions flows, as defined in CEA-608-E, Section C.3.

                Mike

Michael A DOLAN
Television Broadcast Technology, Inc
PO Box 190, Del Mar, CA 92014 USA
+1-858-882-7497 (m)