- From: Pierre-Anthony Lemieux <pal@sandflow.com>
- Date: Fri, 20 Jun 2014 18:05:55 -0700
- To: "public-tt@w3.org" <public-tt@w3.org>
Hi all, During our last call, I noted two concerns with the itts:forcedDisplay feature as currently drafted. (a) the semantics of the itts:forcedDisplay feature are not sufficiently specified (b) the representation of itts:forcedDisplay as an attribute is not desirable To address (a), below is proposed prose: """ The presentation processor SHALL accept an optional boolean parameter called forcedDisplayModeParameter, whose value may be set by the application. If not set, the value of forcedDisplayModeParameter shall be assumed to be equal to "false". If the value of forcedDisplayModeParameter is "true", a content element with a itts:forcedDisplay computed value of "false" shall be assumed to have a tts:visibility computed value equal to "hidden", even if tts:visibility is otherwise set to "true". """ The idea is to essentially ignore the itts:forcedDisplay attribute unless otherwise specifically requested by the application. This also clarifies that itts:forcedDisplay has "no effect on content layout or composition, but merely determines whether composed content is visible or not." As next step, I plan to create examples. Re: (b), I am not comfortable rejecting a solution that users have devised and implemented based on actual use cases and in the absence of specific guidance and/or prohibition in TTML 1.0. Best, -- Pierre
Received on Saturday, 21 June 2014 01:06:44 UTC