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, such as an advertisement, into a Web page. The IFrame below embeds the homepage of this website. Try to interact with the IFrame by clicking on a button on the IFrame homepage. You need to instruct your tests to 'switchTo()' to the IFrame and then when you're done, switch back to the main webpage.

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Cool Fact - this was the first ever video uploaded to YouTube :)