>From a previous thread where I was having the same problem:

SOLUTION/WORKAROUND
WARNING: this requires changing a core tiddler.  The code is there for a 
reason.  My use case is very specific in that I will only be doing this on 
a wiki that runs just to render static tiddlers.

I noticed that the rendering process for the <script> tag renders as 
<safe-script>.  So I just searched and found the tiddler responsible for 
the modification and commented out the code.

The tiddler is $:/core/modules/widgets/element.js  and the code to comment 
out is

if($tw.config.htmlUnsafeElements.indexOf(tag) !== -1)
{ tag = "safe-" + tag;
}

<https://tiddlywiki.com/#>Again this would I imagine create a very serious 
security risk in wikis open to the internet.

I cannot stress enough that this could cause serious issues.  Since it is a 
gist it may just be better to just copy/paste and avoid the potential for 
problems.  
On Friday, February 19, 2021 at 4:57:18 PM UTC-5 [email protected] wrote:

>
> Hi TW users, 
>
> Does anyone know why the embed code for a gist doesn't display in a 
> tiddler? I get an empty box returned. I tried wrapping in an <iframe> also. 
>
> This is the code I am trying to add:
> <script src="https://gist.github.com/protrolium/e0dbd4bb0f1a396fcb55.js
> "></script>
>
> macOS 10.13.6 
> Firefox 85.0.2
>

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