The editors,
The following sections contain references to start-space and end-space.
I assume that these references should be to space-start and space-end.
5.5.1 Word spacing and Letter spacing Properties
These properties may set values for the start-space and end-space
traits, as described in the property definitions."
7.16.2 "letter-spacing"
'For an fo:character that in the Unicode database is classified as
"Alphabetic", unless the treat-as-word-space trait has the value "true",
the start-space and end-space traits are each set to a value as follows:'
7.16.8 "word-spacing"
'For fo:character whose treat-as-word-space trait has the value "true",
the start-space and end-space traits are each set to a value as follows:'
The quote from 7.16.2 continues:
'For "normal": .optimum = "the normal spacing for the current font" / 2,
.maximum = auto, .minimum = auto, .precedence = force, and
.conditionality = discard. A value of auto for a component implies that
the limits are User Agent specific.'
That is, it allows the .maximum and .minimum sub-properties of a <space>
to take on values of "auto". "Auto" is not mentioned as a valid
assignment to these properties in wither the general discussion of
<space> in 5.11, where .maximum, .optimum and .minimum are defined as
<length>s, nor in the discussions of space-start and space-end in 7.11.1
& 7.11.2. Further, in 7.14.1 "block-progression-dimension" and 7.14.5
"inline-progression-dimension", a value of "auto" is defined to set the
three <length> sub-properties to "auto".
Am I right in assuming that, where a compound property is one of the
possible assignments to a property, any specified value imples some
computed setting of each of the compound components? That is, that
there are no circumstances in which a property which may take a compound
"datatype" will have undefined computed values for the components?
In that case, what are the default values of .precedence and
.conditionality for 7.16.2 "letter-spacing" and 7.16.8 "word-spacing"?
7.16.2 and 7.16.8 do not discuss conditionality at all, and only
indirectly mention precedence. 7.16.2 has:
'If it is desired that the letter space combine with other spaces that
have less than forcing precedence, then the value of the "letter-space"
should be specified as a <space> with precedence less than force which
implies that space combines according to the space resolution rules
described in [4.3 Spaces and Conditionality].'
However, in the absence of any specific default setting, the other
indications from the discussion in 5.11 and in sections where the
default values of precedence are spelled out would indicate a default
value of 0. Likewise, the default value for conditionality would seem
to be "discard".
Yours faithfully,
Peter West
--
Peter B. West [EMAIL PROTECTED] http://powerup.com.au/~pbwest
"Lord, to whom shall we go?"
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