Following up on this little discussion with @toscho in chat I went through the first 50 most relevant of 800 questions that contain the word 'iframe' and found there a actually quite some questions that pertain to how to use the
<iframe> tag in the WP context.
EDIT: more examples added
- Here's an example I created
- Another one (there are quite some questions of this type: how to split templates in iframes?)
- One more (this is about allowing iframes in widgets)
Before I proceed retagging the most relevant questions I thought I'd test if I get thumbs up for this.
The downside I can think of is that this tag might easily get polluted with off topic questions ("there's an iframe in my site that I didn't put there and it is loading a script from
welovemayhem.ru, what is happening?")