Re: [csswg-drafts] [css-grid-1] Clarify interaction of percentages and intrinsic sizing and the grid algorithm overall (#3418)

Note that [this comment from @MatsPalmgren](https://github.com/w3c/csswg-drafts/issues/1921#issuecomment-399170288) might be taken into consideration too:
> Given that we sometimes should do two passes of grid sizing, where the first pass is akin to an "intrinsic sizing pass", I think the spec should say explicitly that both passes are supposed to run the algo under "no constraint". And that the grid container's block-axis size is definite and final after the first pass (so that it works similar to the inline-axis).


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