Web Reference: Feb 10, 2022 · JavaScript's Execution Context is the basis for understanding many other fundamental concepts correctly. The Execution Context (GEC and FEC), and the call stack are the processes carried out under the hood by the JS engine that let our code run. Nov 7, 2025 · This page introduces the basic infrastructure of the JavaScript runtime environment. The model is largely theoretical and abstract, without any platform-specific or implementation-specific details. Modern JavaScript engines heavily optimize the described semantics. Jan 17, 2026 · Everything in JavaScript is wrapped inside an execution context, which is an abstract concept (can be treated as a container) that holds all the information about the environment within which the current JavaScript code is being executed.
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