I remember there was a way to embed the notebook into the message, but pasting notebook URL doesn’t do this… aaand, there is no control in the element bar.
Maybe it could be added?h
1 Like
I guess you mean like this:
That’s generated by pasting the iframe code into the forum editor. In this case, we’re talking about this code:
<iframe width="100%" height="102" frameborder="0"
src="https://observablehq.com/embed/@abitrolly/longsparkline?cells=sparkstream"></iframe>
Typically, you get that code from the embed option in the notebook:
1 Like
Thanks. Now I remember. 
But that’s still inconvenient. I wouldn’t have to ask if Discourse could be tuned to automatically expand Observable links into the <iframe>.
The Discourse part that expands links is called Onebox and there is even a plugin to do just that - expand links to iframe.