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Re: Elements styled with width:value% inside a table with width="auto"

From: Shadow2531 <shadow2531@gmail.com>
Date: Wed, 12 Jul 2006 00:39:02 -0400
Message-ID: <6b9c91b20607112139s7925485cn4552a90315ab73db@mail.gmail.com>
To: www-style@w3.org

Thanks Mike

-- 
burnout426

On 7/11/06, Mike Bremford <mike-css@bfo.co.uk> wrote:
>
> > So, it looks like this is up to the UA then to do whatever.
> >
> > Did I get all that right?
> >
>
> Probably :-) CSS gives plenty of wiggle room in some areas.
>
> The idea behind 17.5.2.2 is that you can do something like this:
>
> <html>
>   <head>
>    <style>td { background-color:gray; font-size:10pt }</style>
>   </head>
>   <body>
>    <table><tr><td style="width:10%">Big</td><td style="width:90%">!</
> td></tr></table>
>    <table><tr><td style="width:10%">Bigger</td><td style="width:90%">!
> </td></tr></table>
>   </body>
> </html>
>
> and the UA will try and size the first column to be four times the
> width of the second (however wide that may be). In practice, the UAs
> we've tested appear to determine the minimum width each column has to
> be to display it's content and then attempt to expand each column to
> meet this requirement, as you can see with that example. That's only
> for sizing the columns however - the content is still governed by the
> other rules, which kick in once the column has been sized.
>
>
> Cheers... Mike
>
>
> On 11 Jul 2006, at 06:18, Shadow2531 wrote:
>
> >
> > On 7/10/06, Mike Bremford <mike-css@bfo.co.uk> wrote:
> >>
> >> My understanding is it's undefined: from http://www.w3.org/TR/CSS21/
> >> visudet.html#propdef-width
> >
> > Thanks Mike.  I'll just go over what I got out of your post.
> >
> > For the Textarea situation in first post:
> >
> > 6.4.4 Precedence of non-CSS presentational hints
> > <http://www.w3.org/TR/CSS21/cascade.html#q13>
> >
> > That says:
> >
> > 1. cols is a presentational attribute.
> > 2. If the UA decides to use it, it should be translated to a css width
> > with a specificity equal to 0 and act as if it was inserted at the
> > beginning of the first stylesheet.
> > 3. If a css width for the textarea is defined, it will therefore
> > override the previous css width that was generated from the cols
> > attribute.
> >
> > So, right there, that says if you define a css width, it *overrides*
> > the width generated by the cols attribute.
> > Then, because of the following, the behavior is undefined.
> >
> > 10.2 Content width: the 'width' property
> > <http://www.w3.org/TR/CSS21/visudet.html#the-width-property>
> >
> > "<percentage>
> > Specifies a percentage width. The percentage is calculated with
> > respect to the width of the generated box's containing block. If the
> > containing block's width depends on this element's width, then the
> > resulting layout is undefined in CSS 2.1."
> >
> > For the Image situation in first post:
> >
> > 10.2 Content width: the 'width' property
> > "The width of a replaced element's box is intrinsic and may be scaled
> > by the user agent if the value of this property is different than
> > 'auto'."
> >
> > 10.3.2 Inline, replaced elements
> > <http://www.w3.org/TR/CSS21/visudet.html#inline-replaced-width>
> >
> > "Percentage intrinsic widths are first evaluated with respect to the
> > containing block's width, if that width doesn't itself depend on the
> > replaced element's width. If it does, then a percentage intrinsic
> > width on that element can't be resolved and the element is assumed to
> > have no intrinsic width."
> >
> > So, according to that, since a percentage of the intrinsic width
> > cannot be resolved, the UA should assume that there's no intrinsic
> > width, and if there's no assumed intrinsic width, there's no intrinsic
> > width to fall back on in the case of undefined behavior mentioned for
> > percentages in 10.2
> >
> > So, since none of that helps there are:
> > 17.5.2 Table width algorithms: the 'table-layout' property
> > <http://www.w3.org/TR/CSS21/tables.html#width-layout>
> >
> > and
> >
> > 17.5.2.2 Automatic table layout
> > <http://www.w3.org/TR/CSS21/tables.html#auto-table-layout>
> >
> > The last part of 17.5.2.2 says:
> >
> > "A percentage value for a column width is relative to the table width.
> > If the table has 'width: auto', a percentage represents a constraint
> > on the column's width, which a UA should try to satisfy."
> >
> > Also, there's mention of min and max width in that section.
> >
> > Also, there's this:
> >
> > "Note. In this algorithm, rows (and row groups) and columns (and
> > column groups) both constrain and are constrained by the dimensions of
> > the cells they contain. Setting the width of a column may indirectly
> > influence the height of a row, and vice versa."
> >
> > Section 17.5.2.2 rings a bell and kind of describes what Gecko and
> > KHTML do. When they "try to satisfy" for the undefined percentage
> > situation, they use the intrinsic width of the image and the cols
> > attribute of the textarea to do it. When they do that, they break the
> > css rules listed above, but only after correclty following the rules
> > leads to undefined behavior.
> >
> > So, it looks like this is up to the UA then to do whatever.
> >
> > Did I get all that right?
> >
> > Thanks
> >
> > --
> > burnout426
> >
>
>
>
Received on Wednesday, 12 July 2006 04:39:25 GMT

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