W3C home > Mailing lists > Public > www-style@w3.org > October 2008

[css3-gcpm] border-length

From: Håkon Wium Lie <howcome@opera.com>
Date: Wed, 15 Oct 2008 12:29:54 +0200
Message-ID: <18677.50722.398158.780022@opera.com>
To: MURAKAMI Shinyu <murakami@antenna.co.jp>
Cc: www-style@w3.org

Also sprach MURAKAMI Shinyu:

 > I have questions about the border-length property.
 > 
 > http://dev.w3.org/csswg/css3-gcpm/#the-border-length
 > 
 >     + 1       2 +
 >     8           3
 > 
 >     7           4
 >     + 6       5 +
 > 
 > 1. Is this order absolute regardless of writing-mode?

Yes. It's meant it to be clockwise, just like the
margin/padding/border properties.

 > If so, in vertical text (writing-mode: tb-rl), the footnote area will be
 > specified as the following:
 > 
 >   @footnote {
 >     float: page left;
 >     border-right: thin solid black;
 >     border-length: 0 0 4em 0;
 >   }
 > 
 > Correct?

Yes.

Now, there may be better or more powerful methods to express this. At
the recent F2F it was requested that we find a way to express the
"inverse" of border-length, where corners are hidden, but lines
between them are visible.

Proposals for how to address this is welcome; this is a fairly immature
part of the specification.

Implementation experience is, as always, also helpful.

 > 2. "Percentages: refer to width of element" -- why not "width or height"?
 > 
 > I think that the vertical border's percentages should refer to the height
 > of element.

I'd like to remove asymmetries, if possible. The current spec is
modeled after the width of margins:

  http://www.w3.org/TR/2007/CR-CSS21-20070719/box.html#propdef-margin

which says that percentages "refer to width of containing block". The
problem is that -- in horizontal writing systems -- the height isn't
always known when the border is laid out.

However, in this case, it may not be that serious problem as the
visbility of a border doesn't change the layout.

I'm ok with making the change if there are no objections.

Cheers,

-h&kon
              Håkon Wium Lie                          CTO °þe®ª
howcome@opera.com                  http://people.opera.com/howcome
Received on Wednesday, 15 October 2008 10:30:40 GMT

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