RE: ISSUE-189: do regions scroll their flowed content? [DFXP 1.0]

The note was carefully crafted not to presume there was any actual region scrolling in the presentation processor. However, if we confirm there is no defined scrolling, then (in addition to explicitly saying that) the new text below probably needs to clarify that “similarity” is not the result of an automatic region scroll, but two synchronic documents resulting from some other event.

 

At this point, I don’t much care which way it is.  But we can’t leave region scrolling to be presentation processor dependent, which is the state we seem to be in now. That’s just non-interoperable.

 

Regards,

 

                Mike

 

From: Glenn Adams [mailto:glenn@skynav.com] 
Sent: Thursday, September 27, 2012 5:06 PM
To: Timed Text Working Group
Subject: Re: ISSUE-189: do regions scroll their flowed content? [DFXP 1.0]

 

 

On Thu, Sep 27, 2012 at 11:15 PM, Timed Text Working Group Issue Tracker <sysbot+tracker@w3.org> wrote:

ISSUE-189: do regions scroll their flowed content? [DFXP 1.0]

 

There is no explicit, automatic mechanism for scrolling content inside a region; however, a note was added to 2nd Edition at the end of 9.3.2 as follows:

 

Where an implementation is able to detect significant similarity between two adjacent synchronic document instances, DOCinterN DOCinterN−1, then it is preferred that the implementation make the transition between presenting the two instances as smooth as possible, e.g., as described by  <http://dvcs.w3.org/hg/ttml/raw-file/tip/ttml10/spec/ttaf1-dfxp.html#cea608c> [CEA-608-C], § C.3.