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Observable’s rules for SVG detection are:

  • top level element is instance of SVGSVGElement OR
  • top level element contains exactly one svg element (at any level) AND
    • svg fills at least 75% of top level element’s width OR
    • svg fills at least 75% of top level element’s height

Equivalent conditions apply to canvas detection.

Graphviz plots fail these tests because they nest svg elements. See next answer.

@mbostock I think Observable’s detection could be improved by not counting SVG that are nested inside other SVGs.

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