On Wed, 2022-02-23 at 19:43 +0000, Piez, Wendell A. (Fed)
wendell.piez@xxxxxxxx wrote:
> Hi again Liam,
> 
> Okay so now I am rereading your post and my followup and saying to
> myself, oh, shouldn't we actually be using the markup to make sure
> stuff is properly sandboxed ...?
> 

Potentually, yes. HTML 5 sandbox applies only to iframes currently
(there's discussion of broader applicability but i don't think it's
there yet).

See e.g.
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/iframe#attr-sandbox


Liam

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