- From: Glenn A. Adams <gadams@xfsi.com>
- Date: Sun, 07 Dec 2008 08:51:42 +0800
- To: Sean Hayes <Sean.Hayes@microsoft.com>, Public TTWG List <public-tt@w3.org>
Ah, I misunderstood you. In any case, let's decode your example a bit more carefully: >> <style id="s1" tts:color="brown" /> >> <style id="s2" style="s1" tts:color="black"/> >> <style id="s3" style="s2" /> s1 is easy, and it means: s1 -> { <tts:color,brown> } s2 on the other hand, is derived as follows: s2 -> LEFT-PRECENDENCE < { <tts:color,black> }, s1 > -> LEFT-PRECENDENCE < { <tts:color,black> }, { <tts:color,brown> } > -> { tts:color,black } [N.B. Section 8.4.1 says "Style properties associated by inline styling are afforded a higher priority than all other forms of style association.", so that in resolving s2, the inline style tts:color has precedence over referential styling style="s1".] s3 -> s2 -> { tts:color,black } We get black, and not brown. So perhaps there is no problem here. G. On 12/7/08 7:19 AM, "Sean Hayes" <Sean.Hayes@microsoft.com> wrote: > I wasn't talking about lexical order of elements, but of chains with multiple > links. In a single chain the last referenced style would be the most distant > from the affected element; which is wrong. > > Sean Hayes > Media Accessibility Strategist > Accessibility Business Unit > Microsoft > > Office: +44 118 909 5867, > Mobile: +44 7875 091385 > > > -----Original Message----- > From: Glenn A. Adams [mailto:gadams@xfsi.com] > Sent: 06 December 2008 22:49 > To: Sean Hayes; Public TTWG List > Subject: Re: Specification problem - referential style chaining. > > I disagree. The lexical order of the style element in the document should > have no affect on the order of style resolution in the case of multiple > style chains. The reason for this is that these style specification chains > are semantically ordered via id references, and not lexically ordered > (according to appearance in document order). > > It would also be more difficult for a processor to resolve styles using a > combination of style id references and the order of appearance of the > defining element. > > The spec should not be changed. > > Glenn > > > On 12/6/08 10:01 PM, "Sean Hayes" <Sean.Hayes@microsoft.com> wrote: > >> >> The spec currently says: >> >> " If the same style property is specified in more than one referenced >> specification, then the last referenced style specification applies, where >> the >> order of application starts from the affected element and proceeds to >> referenced style specifications, and, in turn, to subsequent referenced style >> specifications." >> >> I don't think this is clear enough on how referential styling is supposed to >> work.I think it works for cases such as the following: >> >> <style id="s1" tts:color="brown" /> >> <style id="s2" tts:color="black"/> >> <style id="s3" style="s1 s2" /> >> >> An element referencing s3, would have color black. >> >> But in this case: >> <style id="s1" tts:color="brown" /> >> <style id="s2" style="s1" tts:color="black"/> >> <style id="s3" style="s2" /> >> >> The 'last' referenced style here is s1, and thus an element referencing s3, >> would have color brown. >> >> This is not my understanding of how it is supposed to work, which is that the >> order is a linearization of the tree in a depth first pre-order. Such that >> the >> 'last' element is black in both cases. >> >> To clarify this I suggest we edit the last sentence to: >> >> where the order of application is a depth first pre-order tree walk starting >> from the affected element including referenced style specifications, and all >> subsequent referenced style specifications." >> >> Example: >> >> <style id="s1" tts:color="brown" /> >> <style id="s2" style="s1" tts:color="black"/> >> <style id="s3" tts:color="green" /> >> <style id="s4" style="s3" tts:color="yellow"/> >> <style id="s5" style="s4 s2" tts:color="pink" /> >> >> <p style="s5" tts:color="red">...</p> >> >> The depth first pre order for color here would be: >> green, yellow, brown, black, pink, red. >> >> The last and therefore applied color being red. >> >> >> Sean Hayes >> Media Accessibility Strategist >> Accessibility Business Unit >> Microsoft >> >> Office: +44 118 909 5867, >> Mobile: +44 7875 091385 >> >> > >
Received on Sunday, 7 December 2008 00:52:27 UTC