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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Displaying SVG content in EWW
Date: Fri, 18 Oct 2019 15:31:03 +0300
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 (message from Richard Melville on Fri, 18 Oct 2019 13:01:13 +0100)
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> From: Richard Melville <6tricky9@gmail.com>
> Date: Fri, 18 Oct 2019 13:01:13 +0100
> 
>  What does the following display?
> 
>    M-: (image-type-available-p 'svg) RET
> 
>  If it says "nil", you don't have SVG image support built into your
>  Emacs, or don't have one of the requisite shared libraries available.
> 
> Mine returns "No match" rather than "nil".

How did you type that?  M-: means press and hold the META key (perhaps
the Alt key on your keyboard) and then press ':'.  This should display
"Eval: " in the minibuffer, and then you type

  (image-type-available-p 'svg)

and press Enter.

If that's what you did, perhaps there's something here that is
specific to macOS, which I don't use and know almost nothing about.