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According to the XSD the attributes `tts:origin` and `tts:extent` are not allowed to use different units in the same value e.g. the value `"20px 40%"` is forbidden. However TTML1 does not impose such …
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TTML2 differs from TTML1 in the treatment of `` units with no unit. TTML1 says:
>It is an error to omit the units component of a scalar length value.
TTML2 currently says:
> If no _units_ com…
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As presently defined in §10.3.27, `non-negative-real` includes `.0` and `0.0`, but does not include `0.` This creates an interoperability problem with the use of `xs:decimal` [1] in the schema for `tt…
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At present, neither IMSC1.2 nor TTML2 says anything about the case where a document requires a processor to support one profile but declares the document to conform to another profile that is mutually…
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Define an additional feature that specifies processing of rw/rh lengths on `tts:origin`
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Add `top` and `bottom` values to `tts:displayAlign` and add `#displayAlign-absolute feature`; N.B. we defined `#displayAlign-relative` in TTML2 but it constitutes all values in TTML1, which did not ha…
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[https is not enforced as the scheme for github pages created before June 2016](https://help.github.com/en/github/working-with-github-pages/securing-your-github-pages-site-with-https) and has to be ma…
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According to TTML, the [`tt:br` element](https://github.com/ebu/ebu-tt-xsd/blob/214fdc3a6a2a0c91e22cd69a8d9b69a031b68b2a/ebutt.xsd#L332) allows "any attribute in TT Metadata namespace". This includes …
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See #125 for background. Raising this to capture my thoughts on mediaOffset that I have previously discussed during face to face meetings.
There are multiple problems with `ttp:mediaOffset` as curr…
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At present, IMSC's use of profile designators in the TT Profile Namespace is technically out of compliance with TTML2 due to the following language:
**TTML2 (1e) §5.2.3**
>All profile designator…