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

Re: border-radius

From: <Nick_Hofstede@inventivegroup.com>
Date: Wed, 3 Sep 2008 11:36:51 +0200
To: fantasai <fantasai.lists@inkedblade.net>
Cc: Brad Kemper <brkemper.comcast@gmail.com>, www-style@w3.org
Message-ID: <OF3E023E1D.E065BC93-ONC12574B9.00323E35-C12574B9.0034D138@inventivegroup.com>
fantasai <fantasai.lists@inkedblade.net> wrote on 03/09/2008 10:39:23:
> Nick_Hofstede@inventivegroup.com wrote:
> > 
> > The usecase I had in mind was a border-collapsed table with rounded 
> > outer corners. Think a rounded upper-left corner like the slashdot 
> > stories have.
> > 
> >           XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
> >        XX^^                      X                         X
> >       X^                         X                         X
> >      XX                          X                         X
> >      X        First Cell         X      Second Cell        X
> >      X                           X                         X
> >      X                           X                         X
> >      X                           X                         X
> >      XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
> 
> That's covered by the previous paragraph. This one's just talking
> about internal table elements (like rows and cells). I agree with
> David Baron that defining and implementing curved borders for
> internal table elements is complicated and I don't think it would
> be worth doing, at least not right now. For the table element
> itself I agree it makes sense.

Ah ... right. Sorry. It's just all a bit linked in mu mind.

I re-read the first paragraph a few times and I must admit I have trouble 
understanding it.

- What is meant by "the border radii of adjacent corners must not 
intersect"?

- I also have trouble with "The radii of a single corner should not extend 
past the boundaries of the cell at that corner". I think I'm supposed to 
read this as "The radii of a single corner [of the table or inline-table] 
should not extend past the boundaries of the cell at that corner", but 
that doesn't make sense. Radii (plural) for a single corner? Table borders 
not extending past the boundaries of a cell? Not sure how to visualize 
this.

- "If the computed values of the border radii would cause such an effect, 
then all the border radii of the table must be reduced by the same factor 
so that ...". If the effect occurs in the top-left corner for example, 
does "all the border radii" mean that the radius of the bottom right 
corner (which may be fine) will be adjusted as well? Won't this behavior 
change if we decide to add the collapsing rules later?

- (Added after re-reading this mail a few times) Some things seem to make 
more sense if radii is used to mean x and y radius. Is this what was 
intended? If so, shouldn't we clarify this somehow?

Having worked on a layout engine myself (An XSL-FO one. Still working om 
it btw - people start to request features like rounded corners, and the 
XSL-FO working group is looking at the CSS properties for rounded 
borders), I don't think defining how this should behave or implementing it 
would be all that difficult if we simply extend the rules for collapsing 
borders to include a precedence rule for rounding.

Nick




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Received on Wednesday, 3 September 2008 09:37:39 GMT

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