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Re: [css-transforms] Initial value of transform-style

From: Dirk Schulze <dschulze@adobe.com>
Date: Fri, 6 Jun 2014 07:45:44 +0000
To: Simon Fraser <smfr@me.com>
CC: Matt Rakow <marakow@microsoft.com>, Rik Cabanier <cabanier@gmail.com>, "www-style@w3.org" <www-style@w3.org>
Message-ID: <7CE4BCDF-2CA1-4A75-B8F6-A86D29621A8E@adobe.com>
Hi Simon,

On Feb 27, 2014, at 8:03 PM, Simon Fraser <smfr@me.com> wrote:

> On Feb 27, 2014, at 10:41 AM, Matt Rakow <marakow@microsoft.com> wrote:
> 
>>> Simon recently presented a solution at the CSS F2F and posted a document to public-fx [1] to clear some things up.
>>> 1: https://docs.google.com/document/d/1mNF7Z67WnnV05RqXa37PmfvRbgAZwj7-h-7Y_uQ_UPE/edit?pli=1#
>> 
>> Ah, thanks for the pointer.  It looks like the presentation was on the day I wasn't able to make it unfortunately :(
>> 
>> Simon, how do you feel about the "auto" value vs. using inheritance as I suggested in my other mail [1]?  Right now it sounds like "auto" would act as "inherit, unless a transform is applied in which case flat" which still seems a bit confusing to me.  For example, it seems unintuitive that these two examples would produce different results:
>> 
>> <div style="transform-style: preserve-3d; transform: rotateX(30deg);">
>>   <div>
>>       <div>
>>           <div>
>>               <div style="transform-style: preserve-3d; transform: rotateX(30deg);">
>> 
>> <div style="transform-style: preserve-3d; transform: rotateX(30deg);">
>>   <div>
>>       <div style="transform: scale(1)">
>>           <div>
>>               <div style="transform-style: preserve-3d; transform: rotateX(30deg);">
>> 
>> Thanks,
>> -Matt
>> 
>> [1] http://lists.w3.org/Archives/Public/www-style/2014Feb/0783.html
> 
> Making it inherited is an interesting suggestion; Iíd have to think about that. The performance characteristics are obviously a concern for documents with html { transform-style: preserve-3d; } but itís possible that UAs could avoid allocating additional resources for elements with no 3d-transformed descendants in this kind of content.

It actually sounds very reasonable and the goals of an inherited properties seem to fit with the goals we had in mind with a new value Ďautoí quite nicely. Did you have more time to think about it?

Greetings,
Dirk

> 
> Iím currently struggling to figure out how to spec transform-style to avoid an issue noted in that Google doc where a single transformed element renders on top of everything else (but in current UAs, can be obscured by elements with higher z-index).
> 
> Simon
> 
> 
Received on Friday, 6 June 2014 07:46:15 UTC

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