[whatwg] Introduction of media accessibility features

Robert O'Callahan robert at ocallahan.org
Tue Apr 13 20:28:33 PDT 2010

On Mon, Apr 12, 2010 at 12:47 PM, Silvia Pfeiffer <silviapfeiffer1 at gmail.com
> wrote:

> Understood. But what is actually the cost of implementing all of TTML?
> The features in TTML all map onto existing Web technology, so all it
> takes is a bit more parsing code over time.

When implementing one complex spec (TTML + XSL-FO) in terms of another
complex spec (HTML + CSS), you have to be very very lucky to find that all
the features map perfectly, even if the specs were designed to work together
that way, which in this case they are not. Even if you're lucky today,
evolution of the specs could easily accidentally break things.

We could make that problem go away by normatively defining something that
looks like TTML in terms of a translation to HTML + CSS. It wouldn't really
be TTML though, and where's the added value for authors?

I understand the deep political problems here, but I think it's most logical
for styled content for the Web to use (possibly a subset of) HTML and CSS.
Server-side tools to translate between TTML and HTML+CSS would be one way to
address the desire to interoperate with TTML.

"He was pierced for our transgressions, he was crushed for our iniquities;
the punishment that brought us peace was upon him, and by his wounds we are
healed. We all, like sheep, have gone astray, each of us has turned to his
own way; and the LORD has laid on him the iniquity of us all." [Isaiah
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