Re: [w3c/webcomponents] How should various document internal references work when SVG is being used in shadow DOM (#179)

Don't know whether this is the right place to discuss this, but I think it is at least related - sorry for the noise if this is the wrong place:

The [`CanvasRenderingContext#filter`](https://html.spec.whatwg.org/multipage/scripting.html#filters) property can also be used to reference filters declared in SVG and it also uses the [`url`](https://developer.mozilla.org/en-US/docs/Web/CSS/filter#SVG_filter) syntax to reference filters declared in SVG. 

I would hope that it works like this: at least if the canvas which provided the canvascontext lives in the same shadow DOM as the SVG filter, a relative url should resolve to the filter in the SVG. If the canvas  image is currently not in the DOM, I don't see how this could ever resolve to a filter declared in a shadow tree, however.

TBH I haven't tested this, myself; it's implemented in FF and Chrome, only, so far, and I don't know whether there is a spec for this with respect to shadow dom. I just played with that feature and loved it when it works and I was hoping that it would still work inside custom components.

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