There is precedent in `box-shadow` of mentioning an algorithm in the spec, not to require it but to require something "close enough" to it: https://drafts.csswg.org/css-backgrounds/#shadow-blur > The exact algorithm is not defined; however the resulting shadow must approximate (with each pixel being within 5% of its expected value) the image that would be generated by applying to the shadow a Gaussian blur with a standard deviation equal to half the blur radius -- GitHub Notification of comment by SimonSapin Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/2949#issuecomment-408235836 using your GitHub accountReceived on Thursday, 26 July 2018 21:08:39 UTC
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