This editor is designed to help you understand the core technologies behind web development without visual distraction. It focuses on the technical theory and language syntax of HTML, CSS, and JavaScript.
HTML (HyperText Markup Language) is a declarative language used to structure content on the web. It defines semantic elements such as <header>, <section>, <article>, <footer>, and more. Each element in HTML provides meaning to the content, making it machine-readable and accessible. HTML documents follow a hierarchical DOM (Document Object Model) structure, enabling nesting and referencing through tags and attributes.
CSS (Cascading Style Sheets) is a rule-based language that describes the visual presentation of HTML elements. It operates through a system of selectors and declarations, allowing for precise control over properties such as color, typography, layout, spacing, and responsiveness. CSS supports inheritance, specificity, and media queries, enabling adaptive design across different devices and screen resolutions. Core concepts include the box model, stacking context, and rendering flow.
JavaScript is a high-level, interpreted programming language used primarily for client-side web development. It enables dynamic behavior, event handling, asynchronous communication (via Promises, async/await, and XMLHttpRequest or Fetch), and DOM manipulation. JavaScript operates within the browser’s execution environment and interacts with the Web APIs provided by the browser, such as the DOM API, Fetch API, and Web Audio API. It supports object-oriented, functional, and imperative paradigms.