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Re: [css4-images] element() syntax (was: First draft of css4-images, feedback requested)

From: Robert O'Callahan <robert@ocallahan.org>
Date: Thu, 9 Aug 2012 11:00:56 +1200
Message-ID: <CAOp6jLab7Soy27-68ihXWBBxYhnT4YW3M_OMHefTUjtzRQ0ShQ@mail.gmail.com>
To: Simon Fraser <smfr@me.com>
Cc: "Tab Atkins Jr." <jackalmage@gmail.com>, Rik Cabanier <cabanier@gmail.com>, www-style list <www-style@w3.org>
On Thu, Aug 9, 2012 at 9:00 AM, Simon Fraser <smfr@me.com> wrote:

> It also means that the appearance of descendants of the element() target
> may change when rendering for element(), because of z-order. Consider:
> <div id="box" style="position: absolute; background-color: blue;">
>     <div style="background-color: green; position: absolute; z-index:
> -1"></div>
> </div>
> <div style="background: element('#box')"></div>
> The original #box will look like a blue square, but when rendered for
> element()
> it will show green.

That's true, but the alternatives are worse IMHO.

If it is really impossible for you to handle cases where the target is not
a stacking context, I think the next best solution would be to say that for
element() only renders elements in a document if they meet certain criteria
that guarantee they'll be visually atomic. E.g., we could require that the
target element is either a replaced element or positioned with z-index not
'auto'. (I think that's more confusing for authors than what's currently
specced though.)

Another questions about element(); does clipping via overflow or clip
> on the target element or any ancestor affect the element() rendering? I
> could imagine
> a use case where the original element has overflow:hidden, but when
> rendered via
> element() it displays unclipped.

I think clipping on the target element should take effect, but clipping on
ancestors should not.

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Received on Wednesday, 8 August 2012 23:01:24 UTC

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