Using this market as an example:

https://manifold.markets/PatrickDelaney/will-ai-achieve-significantly-more

If you attempt to share the market using, "embed code" at the bottom of this screen:

You get the following (remove the X):

<iXframe src="https://manifold.markets/embed/PatrickDelaney/will-ai-achieve-significantly-more" title="Will A.I. Achieve Significantly More, "Linguistic Temporal Understanding" by end of 2023?" frameborder="0" width="600" height="300"><iXframe>

Which is a literal rendering of the double quotaton character, rather than typographic.

So basically on some websites, perhaps personal blogs, the iframe won't render because it's using the literal " character.

I suspect this may be true for other characters as well...?

https://www.w3.org/wiki/Common_HTML_entities_used_for_typography

Alternate method (remove X):

  <iXframe src="https://manifold.markets/embed/PatrickDelaney/will-ai-achieve-significantly-more?r=UGF0cmlja0RlbGFuZXk" title="Will A.I. Achieve Significantly More, &ldquo;Linguistic Temporal Understanding&rdquo; by end of 2023?" frameborder="0" width="600" height="300">
   </iXframe>

Testing here (having removed the X in the code above):

I would think that Manifold would want to maximize its outside-of-application sharing capability across the web.