Add SVG <use> and @font-face as other use cases
#26
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I recently realized that SVG
<use>hrefreferences cannot cross shadow boundaries: WICG/webcomponents#772Additionally,
@font-face'sfont-familycannot be used across shadow boundaries either: https://robdodson.me/posts/at-font-face-doesnt-work-in-shadow-dom/ (Ahis post discusses the fact that it doesn't even work within the same shadow root, but that's a browser bug. In any case, it can't be referenced across shadow roots.)I think it's worth calling out any cross-root use cases we can think of, just to consider if we can solve those at the same time.