HTML iframe element

The <iframe> HTML element represents a nested browsing context, embedding another document into the current one.

Each embedded browsing context has its own document and allows URL navigations. The navigations of each embedded browsing context are linearized into the session history of the topmost browsing context. The browsing context that embeds the others is called the parent browsing context. The topmost browsing context — the one with no parent — is usually the browser window, represented by the Window object.

Warning: Because each browsing context is a complete document environment, every <iframe> in a page requires increased memory and other computing resources. While theoretically you can use as many <iframe>s as you like, check for performance problems.