A browsing context is the environment a browser displays a Document. In modern browsers, it usually is a tab, but can be a window or even only parts of a page, like a frame or an iframe.
Each browsing context has a specific origin, the origin of the active document and a history that memorize all the displayed documents, in order.
Communication between browsing context is severaly constrained. Between browsing context of the same origin, a BroadcastChannel can be opened and used.
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- See origin