Hi @ylafon good question. L, as a measured value, can never be less than zero. I also can't think of any intermediate computation which would cause it to become less than zero, although values somewhat greater than 100 can arise. The 400 value to maybe account for HDR is handwaving. -- GitHub Notification of comment by svgeesus Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/289#issuecomment-447100086 using your GitHub accountReceived on Thursday, 13 December 2018 19:57:23 UTC
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