Re: [csswg-drafts] [css-grid] Percentages and intrinsic size

They're not defined that way; there's a non-normative summary sentence
 (using the word "essentially", and another one using "as if") making 
a general statement that they operate as if they're empty.  But 
there's nothing normative stating that; as the spec is written, "treat
 as `auto`" would indeed result in different sizes in some cases.

However, we discussed this at the F2F 
([resolution](https://log.csswg.org/irc.w3.org/css/2017-01-13/#e761591))
 and resolved that percentages are 0 for determining intrinsic width, 
but still resolve at used-value time, giving us the Chrome behavior 
(where the yellow track overflows the grid container, in Manuel's 
example).


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