- From: Ian Hickson <ian@hixie.ch>
- Date: Fri, 30 May 2008 21:11:40 +0000 (UTC)
On Fri, 30 May 2008, ?istein E. Andersen wrote:
> > [I wrote:]
> >> PS: How should colour be added to tables like these in HTML5 with
> >> neither of the attributes bgcolor and style?
> >
> > Class attribute and external stylesheets. (Possibly a data-* attribute.)
>
> I actually thought this might be one of the cases that could reasonably
> and legitimately be solved using the style attribute (which was, I believe,
> still absent from the draft when my PS was written), so it is interesting
> to see that you think otherwise. I would like to point out that your suggested
> solution would require a style sheet along the following lines: [...]
>
> Adding 256 classes (of which 100--200 are actually used in each document)
> is certainly feasible.
>
> However, this solution would not seem to be practical for a colour
> scheme using a larger number of colours. Would your mantra remain the
> same given, e.g., 256^2 or 64^3 distinct shades of colour? If not, where
> should the boundary be drawn?
I was thinking more along the lines of:
<td data-value="2838">..</td> <!-- value ranges from 0..10000 -->
...with:
td[data-value] {
background: rgb(calc(255-255*attr("data-value")/10000),
calc(255*attr("data-value")/10000),
calc(127-63*abs(attr("data-value")/10000-0.5))));
}
...which would require some changes (in particular, adding "abs()" and
allowing colour calculations) to the calc() and attr() proposals, but
would be significantly better than hard-coding the colours into the
markup or having a bazillion classes.
--
Ian Hickson U+1047E )\._.,--....,'``. fL
http://ln.hixie.ch/ U+263A /, _.. \ _\ ;`._ ,.
Things that are impossible just take longer. `._.-(,_..'--(,_..'`-.;.'
Received on Friday, 30 May 2008 14:11:40 UTC