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Regarding initial value of tts:lineHeight #87
TTML1SE added a non-normative recommendation for lineHeight: 8.2.12: "Note: It is recommended that presentation processors use a computed line height that is 125% of the size of the largest applicable font size when the value normal is specified. The choice of 125% allows use of a font size of 0.8c in order to obtain a line height of 1c."
However, the WG had previously agreed to 120% which was codified in an editor's draft after closing ISSUE-275. The issue includes the rationale. The Note was a last minute change for the reason stated in the last sentence in the note.
Implementations had been developed to roughly 120% which was re-enforced by the editor's draft text.
This recommendation should be revisited and normative provisions added to TTML2.
Detailed background information can be found here: http://lists.w3.org/Archives/Public/public-tt/2013Aug/0057.html
This is also related to ISSUE-283 and ISSUE-302.
(raised by Mike Dolan on 2013-10-11)
Also, for CSS in general the equivalent to
I'm not clear what normative provisions yoyu wanted to add to TTML2 @mikedo ? Some work has been done on