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ISSUE-284: value of lineHeight [TTML2]

From: Timed Text Working Group Issue Tracker <sysbot+tracker@w3.org>
Date: Fri, 11 Oct 2013 15:11:34 +0000
Message-Id: <E1VUeNK-0002FZ-Ed@shauna.w3.org>
To: public-tt@w3.org
ISSUE-284: value of lineHeight [TTML2]

http://www.w3.org/AudioVideo/TT/tracker/issues/284

Raised by: Mike Dolan
On product: TTML2

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.

This is also related to ISSUE-283.
Received on Friday, 11 October 2013 15:11:35 UTC

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