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IFrame (from inline frame) is an HTML element which, similar to the Object element, makes it possible to embed another HTML document inside the main document. The size of the IFrame is specified in the surrounding HTML page, so that the surrounding page can already be presented while the IFrame is still being loaded. The IFrame behaves much like an inline image and the user can scroll it out of view. On the other hand, the IFrame window can contain its own scroll bar. The embedded document can also be replaced by JavaScript without reloading the surrounding page, which makes many interactive applications possible, and IFrames are therefore used by many Ajax applications. The main alternative to using an IFrame in these situations is editing a document's DOM tree. While regular frames are typically used to logically subdivide the content of one website, IFrames are more commonly used to insert content (for instance an advertisement) from another website into the current page. Example of an HTML page using an IFrame: The below material comes from the website
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