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Re: Comments from PFWG on CSS3 Speech Module

From: Daniel Weck <daniel.weck@gmail.com>
Date: Mon, 17 Oct 2011 00:25:32 +0100
Cc: www-style@w3.org, Bert Bos <bert@w3.org>, List WAI Liaison <wai-liaison@w3.org>, List WAI PF <w3c-wai-pf@w3.org>
Message-Id: <6CBF2D96-3135-4FB3-AAC7-EC2EF7BD75BD@gmail.com>
To: Janina Sajka <janina@rednote.net>
there is an analogy between the volume levels that apply within the context of the "aural box model" defined by the CSS Speech specification, and the visibility of elements within the traditional CSS box model. In the visual world, invisible elements still
occupy an area within the rendering space (i.e. the content is missing but the "box" is allocated nonetheless).

Authors can use 'display:none' to properly "remove" content, and there is a similar feature in CSS3 Speech to properly deactivate an element within the aural dimension.

Note that the 'silent' feature is compatible with the SSML model, and that one of the CSS-Speech design goals is to equip authors with mechanisms to represent equivalent SSML content (as best as possible).

As for use-cases, the 'silent' value may be useful for fully fading volume levels in and out, or for authoring spoken text with "fill-in the blanks" empty spans. I am sure that are other valuable and creative usages though. :)

Does this address your concerns?
Kind regards, Daniel

On 11 Oct 2011, at 20:25, Janina Sajka wrote:
> 2.)	voice-volume: silent;
> The spec should give an example of expected appropriate usage of this value.
> Because this generates a period of silence equal to the length of the
> would-be-spoken content, most listeners will just assume speech output has
> prematurely stopped. In radio terms, this is "dead air." How do you expect this
> value to be useful?
Received on Sunday, 16 October 2011 23:26:18 UTC

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