What is IFrame code?
IFrame allows you to embed a traditional frame, as well as separate HTML documents on different pages without using the <iframe> tag. The result is that a demonstration of content from another URL appears on the web page, with or without scrolling. IFrame test will help you to check whether a certain URL has IFrame code.
Why is it important to test your pages for using IFrame code?
Pages that included IFrames have more than one URL. One is for the page on which the iFrame is placed, and the other is for the page from which it is extracting content. Sometimes it causes issues with crawling by search engine bot.