OK - so "auto-sized" *and* "zero-sized" *both* refer specifically to the dimension that we're trying to measure, and the hypothetical float's containing block is meant to be the same as the measured-element's containing block. Also, I think the hypothetical float needs to have `{height|width}:100%` in the not-being-measured dimension, in order for percent sizes on the element itself to resolve against the actual containing block size. Like this: https://jsfiddle.net/p9959s27/ If I don't include `height:100%` on the hypothetical float here, then the float & canvas each end up huge. With all that, I think the spec matches reality & makes sense. -- GitHub Notification of comment by dholbert Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/2128#issuecomment-354315444 using your GitHub accountReceived on Thursday, 28 December 2017 16:28:52 UTC
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