Re: [fxtf-drafts] [filter-effects-1] Clarify radius with multiple values handling in feMorphology (#389)

> Surprisingly, many will ignore `radius="0"` too, while it clearly stated that this should result in a transparent image.

The Filters spec. says that in that case the result is the filter input image. This got changed from SVG 1.1, where it [said that the output should be a transparent black image](https://www.w3.org/TR/SVG11/filters.html#feMorphologyElement). So Chrome, Batik, and librsvg are correct in that case.

I am interpreting the note about negative and zero values so that it also applies to the two-value syntax. So, according to that only Batik is correct in the `radius="10 0"` case. I.e. the value disables the effect and the input image is rendered.

Though I agree that the text could be clearer regarding the two-value syntax.

Sebastian

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Received on Friday, 27 December 2019 23:58:29 UTC