Re: [fxtf-drafts] [w3c/fxtf-drafts] [filter-effects-2] Suggestion: add offset attribute(s) to feTurbulence

I think this is a good idea.

> or preferably, have it be modulo the width and height

Wouldn't this be equivalent to not doing the modulo, as the pattern is periodic in width / height anyway?

(I briefly investigated the discontinuity in Firefox; in the [simplified testcase](https://codepen.io/mstange/pen/rJvRpX?editors=1000) you can see that there are no seams at certain `dy` values and window sizes, but at different ones there's overlap between the two turbulence effects, probably due to bad pixel snapping / rounding in Firefox.)

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