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For a few years Emacs has had SVG support, however I don't know of a reliable way to detect it, before using it.

How can we detect in EmacsLisp, SVG rendering ability in the current Emacs GUI (X/NS/Mac/Win etc.)

It's not sufficient to assume a GUI build has SVG support, as this is not always the case.

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Maybe some clue in 'image.el'..

C-h v image-type-available-p

image-type-available-p is an autoloaded compiled Lisp function in `image.el'.

(image-type-available-p TYPE)

Return non-nil if image type TYPE is available. Image types are symbols like `xbm' or `jpeg'.

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    Specifically (image-type-available-p 'svg) - Thank you!
    – ocodo
    Commented Apr 25, 2015 at 2:09

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