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Re: [CSS2.1] Interop Issue in regards to fixed/absolute positioned children inside of inline-relative containers

From: Boris Zbarsky <bzbarsky@MIT.EDU>
Date: Tue, 15 Jul 2014 15:12:29 -0400
Message-ID: <53C57D1D.5010605@mit.edu>
To: www-style@w3.org
On 7/14/14, 7:18 PM, Greg Whitworth wrote:
> We have found an interop issue on how an inline-relative’s offset should
> affect a fixed/absolute element.

To be clear, this is about the case when the absolute/fixed element has 
auto offsets so what matter is the "static position" of CSS 2.1 section 
10.3.7, right?

> Absolute Example: http://jsfiddle.net/eUV76/1/embedded/result/

Let's focus on this one, since I agree that absolute and fixed position 
should be treated identically here.

In particular, let's focus on the "relative with offset:" case.

For the case it's interesting to look at what actually happens if the 
positions are set to static: http://fiddle.jshell.net/eUV76/4/show/

I agree that it looks odd that Firefox is not vertically moving the 
green bit and not moving the blue bit at all.  That said, the vertical 
position of the green bit looks odd to me in IE as well, given where the 
static position is.

The spec, of course says:

   But rather than actually calculating the dimensions of that
   hypothetical box, user agents are free to make a guess at its
   probable position.

-Boris
Received on Tuesday, 15 July 2014 19:12:58 UTC

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