Syntax Representation – ttp:pixelAspectRatio
@@ -5279,6 +5279,11 @@ numerator | denominator
the root container region is determined by .
A ttp:pixelAspectRatio attribute is considered to be significant only
when specified on the tt element.
+The ttp:pixelAspectRatio attribute should not be specified
+unless a tts:extent attribute consisting
+of two <length> specifications using px (pixel) units is also
+specified on the tt element,
+without which the use of a ttp:pixelAspectRatio attribute is deprecated.
ttp:subFrameRate
@@ -14844,7 +14849,12 @@ units
if px (pixels) units were specified.
The unit of measure px (pixel) corresponds to a logical pixel of
the document coordinate space,
-as defined by .
+as defined by ; however,
+the px (pixel) unit should not be used in a <length> expression
+unless a tts:extent attribute consisting
+of two <length> specifications using px (pixel) units is
+specified on the tt element,
+without which the use of the px (pixel) unit of measure is deprecated
When specified relative to a font whose size is expressed as a single length
measure or as two length measures of equal length, the unit of measure em is considered to be
identical to that defined by , § 5.9.13;
@@ -17677,7 +17687,6 @@ in the preceding syntax definition.
minutes, seconds, and frames less than 10. Minutes are constrained to
[0…59], while seconds (including any fractional part) are constrained to the closed
interval [0,60], where the value 60 applies only to leap seconds.
-
Except when ttp:timeBase is clock
and ttp:clockMode is local or utc,
use of the special value of 60 seconds to denote a leap second is deprecated.