HTML5 defines several embedded content elements, which, from a bird\'s-eye view, seem to be very similar to the point of being largely identical.
What is the actual
Another reason to use object over iframe is that object sub resources (when an performs HTTP requests) are considered as passive/display in terms of Mixed content, which means it's more secure when you must have Mixed content.
Mixed content means that when you have https but your resource is from http.
Reference: https://developer.mozilla.org/en-US/docs/Web/Security/Mixed_content