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In JavaScript, the top-level object is the global object, which is window in browsers and global in Node.js. This object serves as the default context for all variables and functions defined in the global scope. It allows for the storage and access of global variables and functions, making them accessible throughout the code. In strict mode, however, the global context behaves slightly differently, and variables defined without var, let, or const do not become properties of the global object.

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