This document provides a comprehensive overview of web development using HTML, CSS, and JavaScript, focusing on the elements and their functions within each language. The HTML documentation covers essential tags such as , , , , , , , , , , , , , headings ( to ), , , , , , , , , and . Each element is explained with its purpose and usage in creating a webpage structure. The CSS documentation details styling properties like background-color, position, text-align, width, margin, clear, top, padding, border-color, display, height, font-size, and padding-left, illustrating how these properties are used to control the visual presentation of the website. The JavaScript documentation briefly mentions its role in client-side scripting, connecting to external script files, and validating input values. The document serves as a reference for understanding the fundamental aspects of web development, offering insights into how HTML, CSS, and JavaScript work together to build a functional and visually appealing website.