Re: [csswg-drafts] [css-shapes] Specify algorithms for computing line-box intrusion into float's margin box.

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 

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