Views "unfiltered text" headers/footers strip iframes and other HTML elements (such as audio) prior to rendering the text. This goes contrary to the description which reads "Add unrestricted, custom text or markup. This is similar to the custom text field." Users currently must use the "text area" header/footer -- with a formatter that doesn't limit HTML tags -- if they want to include an iframe or other HTML elements.
Expected behavior is either:
-- Users should be able to input an iframe into an "unfiltered text" header/footer
-- The descriptive text should be updated to reflect that iframes are not allowed.
I copied a lot of this description above from an issue that was happening in Drupal 8 that is exactly the same problem in Drupal 7. Weird this has never been caught.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Absolutely infuriating the degree to which there is built-in html correction that can't be turned off. Even with "raw input" filter I can't for example have an unclosed div as a header
to do an extra div wrapper. Overengineered to the point it's broken, sadly :'(