If the OP wants to modify the actual HTML files rather than using
JavaScript the attached Perl script might be of interest.

Den ons 26 okt. 2022 08:32Bernhard Donaubauer <bdonauba-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> skrev:

>
> > These are links, not embedded resources. --self-contained is for
> embedding resources. I don't consider it a bug.
>
> Yes these are links but links to local resources. Image files that are in
> the same directory as my MD file.
> As far as I know the current browser generation has support for DATA URI
> in the href attribute, so it's
> technically feasible.
>
>
> > If your document links to an external website, should we be including
> it, too, in a self-contained HTML page? How would we even do that, since a
> page is a page, not multiple pages?
>
> Links to external web sites and resources shouldn't be changed of course.
> But In my opinion one should here differentiate between:
>
>   href="images/mypic.png"
>
> and
>
>   href="https://www.wikipedia.de"
>
>
> In the meantime I was able to implement this feature with the help of a
> javascript library, so I won't argue but I would have preferred a pure
> markdown solution.
>
> Regards,
> Bernhard
>
>
>
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