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Client-side JavaScript supplies browser and DOM objects that let scripts change webpage content, structure, and appearance.
Client-side JavaScript extends the core JavaScript language with browser-specific objects and APIs that allow scripts to control webpages and their Document Object Model (DOM). Through these capabilities, JavaScript can create, modify, and position HTML elements, change how a page looks, and respond to user interactions such as mouse clicks, form input, and page navigation. The browser acts as the host environment, exposing document objects and events to JavaScript code. The DOM is separate from the ECMAScript language specification: ECMAScript defines the standardized JavaScript language, while the W3C and WHATWG define how HTML document objects are represented and accessed. Modern browsers such as Firefox, Chrome, Edge, and Safari provide the tools needed to run client-side JavaScript, including developer consoles for testing code. Client-side JavaScript differs from server-side JavaScript, such as Node.js, which runs outside the browser and provides server-related features like database communication and file manipulation.
Client-side JavaScript supplies browser and DOM objects that let scripts change webpage content, structure, and appearance.
JavaScript can respond to browser events, including mouse clicks, form input, and page navigation.
The ECMAScript specification standardizes the core language, while the DOM is standardized separately by web standards organizations.
Modern web browsers include JavaScript consoles that allow developers to enter, execute, and test scripts interactively.
Browser JavaScript is distinct from server-side JavaScript, which provides functionality for servers, databases, and file operations.
JavaScript that runs in a web browser to control webpage content, presentation, and user interactions.
A structured representation of an HTML document that scripts can access and modify.
The web browser environment that provides JavaScript with access to webpage objects, events, and browser functionality.
The standardized specification defining the core JavaScript language.
A browser developer tool used to enter, execute, and inspect JavaScript code.
An occurrence such as a click, form input, or page navigation to which JavaScript can respond.
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