Valid is what is conforming for developers to write and what a validator would complain about. It has no effect on serialization (or parsing). I think HTML varies in where whitespace is allowed and examples in the HTML standard vary as to whether they are valid or not (there's some invalid examples to make a point). Here it probably makes sense to allow whitespace given the examples written thus far. -- GitHub Notification of comment by annevk Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/2412#issuecomment-437373886 using your GitHub accountReceived on Friday, 9 November 2018 14:23:00 UTC
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