What can <iframe> do in html5

Answer 1

it can do this

https://code.sololearn.com/WYl9BGce0f7P/?ref=app

Answer 2

An IFrame (Inline Frame) is an HTML document embedded inside another HTML document on a website. The IFrame HTML element is often used to insert content from another source(other sites), such as an advertisement, into a Web page.
Generally it is used to add advertisements into your HTML page / Web page.