When a web page containing JavaScript is loaded in a web browser, several steps are involved in the execution of the JavaScript code. These steps can be summarized as follows:
1. HTML Parsing: The web browser begins by parsing the HTML content of the web page. It constructs a Document Object Model (DOM) tree, which represents the structure of the HTML elements on the page.
2. JavaScript Parsing: When the browser encounters a script tag or an external JavaScript file, it initiates the JavaScript parsing process. The JavaScript code is fetched and parsed by the browser's JavaScript engine. The parsing stage involves tokenizing the code and creating an abstract syntax tree (AST) to represent the structure and semantics of the code.
3. Variable and Function Hoisting: During the parsing phase, the browser identifies variables and function declarations and hoists them to the top of their respective scopes. This means that they are registered in memory before the actual execution starts.
4. Execution Context Creation: Once the parsing is complete, the browser creates an execution context for the JavaScript ....
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