Expand/Collapse Widget Examples

HTML (HyperText Markup Language) is the standard markup language for creating web pages. It describes the structure of a web page semantically and originally included cues for the appearance of the document.

Key Features:

• Defines the structure and layout of web content
• Uses tags and elements to mark up text, images, and other content
• Works alongside CSS and JavaScript to create modern websites
• Platform-independent and supported by all browsers

CSS (Cascading Style Sheets) is used to style and layout web pages. It allows you to control the visual presentation of HTML elements.

Modern CSS Features:

• Flexbox for flexible layouts
• Grid for two-dimensional layouts
• Custom properties (CSS variables)
• Animations and transitions
• Responsive design with media queries

CSS can be applied inline, internally, or externally through separate stylesheets, with external being the most maintainable approach.

JavaScript is a high-level, interpreted programming language that enables interactive web pages. It's an essential part of web applications.

Core Concepts:

• Variables and data types
• Functions and scope
• Objects and arrays
• DOM manipulation
• Event handling
• Asynchronous programming

Popular Uses:

JavaScript is used for form validation, dynamic content updates, animations, API interactions, and building complete single-page applications (SPAs) with frameworks like React, Vue, and Angular.

Web accessibility ensures that websites, tools, and technologies are designed and developed so that people with disabilities can use them.

WCAG Principles:

• Perceivable: Information must be presentable to users in ways they can perceive
• Operable: Interface components must be operable by all users
• Understandable: Information and operation must be understandable
• Robust: Content must be robust enough for various user agents

Implementing accessibility features benefits all users, not just those with disabilities, by creating a better overall user experience.

Responsive web design is an approach that makes web pages render well on a variety of devices and window or screen sizes.

Key Techniques:

• Fluid grids using relative units (%, em, rem)
• Flexible images that scale with the layout
• Media queries to apply different styles based on device characteristics
• Mobile-first approach
• Viewport meta tag for proper scaling

Benefits:

Responsive design provides an optimal viewing experience, reduces maintenance costs, improves SEO, and ensures your website works on future devices.