Simple and excellent!

Thank you so much!
My problem was mainly that my friends for whom I make wesites do implement their content themselves, as “editors”. But in WordPress, for security reasons, editors are not allowed to use iframe (among other codes). My knowledge in coding was not enough to overcome that problem.
With your plugin, Webvitaly, this problem is solved in a very simple way. My editors can insert iframes in posts.

I am dilighted. Thank you Thank you Thank you ??