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). -- GitHub Notification of comment by tabatkins Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/509#issuecomment-277095944 using your GitHub accountReceived on Thursday, 2 February 2017 21:52:41 UTC
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