RE: [CSS3 Values] referencing width or height explicitly

#  <number-multiplicative-expression> :=
#     <number-term> |
#     <length-multiplicative-expression> '/' <length-term> |
#     <length-multiplicative-expression> 'mod' <length-term>

<length-term> can't have units?

-----Original Message-----
From: Tab Atkins Jr. [] 
Sent: Friday, August 19, 2011 10:59 AM
To: Brian Manthos
Subject: Re: [CSS3 Values] referencing width or height explicitly

On Fri, Aug 19, 2011 at 10:45 AM, Brian Manthos <> wrote:

> Is there a way to reference both width and height of the associated element
> explicitly via calc()?
> If not, can we add it to the proposal list for CSS4 Values?
> Having such support would allow more flexible specification of properties
> (such as gradients) that are sensitive to aspect ratio.  In retrospect,
> aspect ratio would be enough to solve some of the scenarios, but having
> width and height (and doing division within the calc when you want aspect
> ratio) is much more powerful.

In general, allowing this exposes circularity problems.  You really
want to expose this explicitly as an aspect ratio, via something like
the aspect-ratio property I have written up on my blog:

Even if there were "element width" and "element height" units, you
couldn't use them in calc() to do things aspect-ratio related, because
you can't divide by a dimension.

> [Sidenote: “W3C Working Draft 19 September 2006”..  eep!]

Yeah, why do you think Fantasai and I are trying to get it updated?  ^_^


Received on Friday, 19 August 2011 19:34:36 UTC