When a user visits a page, the browser loads it

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User-side JavaScript
When developing web applications, programmers write various functions in the code that are associated with certain events, such as clicking the mouse or hovering the cursor over a certain area, and are able to make changes to HTML and CSS. Let's look at an example of JavaScript running on the client side when loading pages:


During loading, the page and all its elements – buttons, shortcuts, drop-down menus pakistan rcs data – are converted into the document object model (DOM).
The JS engine built into the browser interprets JavaScript code into bytecode, which is responsible for communicating the syntax with the computer.

Any event, such as clicking on an icon, initiates the execution of the corresponding JS code blocks. After the engine interprets the bytecode, the corresponding changes are made to the document object model.
The web browser displays the new Document Object Model.