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Re: [css3-2d-transforms] Transforms and background-attachment:fixed

From: Simon Fraser <smfr@me.com>
Date: Tue, 12 Oct 2010 16:41:43 -0700
Cc: "www-style@w3.org list" <www-style@w3.org>
Message-id: <E3501462-C514-47D3-80F1-2DA3652251C3@me.com>
To: Sylvain Galineau <sylvaing@microsoft.com>
On Oct 12, 2010, at 3:43 PM, Sylvain Galineau wrote:

> The red section of the introduction [1] asks:
> 
> # What do fixed backgrounds do in transforms? They should probably 
> # ignore the transform completely, since - even transformed - the object 
> # should be acting as "porthole" through which the fixed background can be 
> # viewed in its original form.
> 
> The suggested behavior would seem to be the one authors would expect. No
> browser currently does this, however. The spec should define this normatively.
> 
> [1] http://www.w3.org/TR/css3-2d-transforms/#introduction

For 2D transforms, would be possible to implement the described behavior, but
at great cost to animation performance.

For 3D, it would be extremely hard. What does a fixed background look like for
something that is angled towards you?

Simon
Received on Tuesday, 12 October 2010 23:42:19 GMT

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