Now that I had a bit of sleep, I realized that I misread the subject of
your initial email; I didn't notice you used "sandbox" as a verb, and I
got confused.  Whoopsie, sorry.

So, yes, embedding another web page as an iframe in your tiddlywiki will
do the following for you, by default:

  * Forbid the embedded page any access/manipulation of your tiddlywiki
    (iframes cannot access the DOM of their parent unless they are part
    of the same website, which is not your case)

  * Forbid execution of code in that embedded page (by default iframes
    are not allowed to run scripts/code)

Since you are embedding a page that has a video in it, that will most
likely require you to allow the iframe to run code; that restriction
can be lifted with <iframe sandbox="allow-scripts"> ; see
https://developer.mozilla.org/en-Us/docs/Web/HTML/Element/iframe#attr-sandbox
for the details.

On Mon, Mar 29, 2021 at 11:47:54PM -0700, Sapphireslinger wrote:
> Thank you. Very reassuring.
> 
> On Tuesday, March 30, 2021 at 11:20:53 AM UTC+8 Javier Rojas wrote:
> 
> > On Mon, Mar 29, 2021 at 07:13:28PM -0700, Sapphireslinger wrote:
> > > But what would happen if I accidentally clicked the "accept cookies" 
> > pop-up 
> > > within the iframe? *Would it embed cookies into my Tiddlywiki? *Or would 
> > it 
> > > only accept the cookies into the (Firefox) browser running my Tiddlywiki?
> >
> > I ... don't entirely grok what you're doing... but, regarding cookies,
> > they won't end up in tiddlywiki and will not modify it in any way; they
> > will be stored by your browser.
> >
> > Cheers,
> >
> 
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