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A browsing context is an environment in which 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 an origin (that of the active document) and an ordered history of previously displayed documents. https://developer.mozilla.org/en-US/docs/Glossary/Browsing_context

TIL: install json-server to have a local http server serving JSON $ npm install -g json-server $ json-server --watch db.json https://www.npmjs.com/package/json-server