iframe

The <strong>HTML <code><iframe></code> element</strong> represents a nested browsing context, effectively embedding another HTML page into the current page. In HTML 4.01, a document may contain a <code>head</code> and a <code>body</code> or a <code>head</code> and a <code>frameset</code>, but not both a <code>body</code> and a <code>frameset</code>. However, an <code><iframe></code> can be used within a normal document body. Each browsing context has its own session history and active document. The browsing context that contains the embedded content is called the <dfn>parent</dfn> browsing context. The <dfn>top-level</dfn> browsing context (which has no parent) is typically the browser window.