by lgrapplications on WordPress.org
Many WordPress administrators disable the ability to insert unfiltered_html for Editors and Authors roles to avoid being hacked via iframe or other ht …

This screen shot shows the Administrator's Settings page. The page is showing a couple of error messages that you will see when you first install the plugin (see item 5 under Installation).
Many WordPress administrators disable the ability to insert unfiltered_html for Editors and Authors roles to avoid being hacked via iframe or other html elements that have an src attribute associated with them.
This plugin:
The following video tutorials will walk you through configuring the “Responsive IFrame Watchdog” on you site and how to embed objects.