HTML5, CSS3 and JavaScript Skills Guide

This HTML5, CSS3, and JavaScript skills guide summarizes the knowledge commonly measured in front-end development assessments and older certification objectives. Specific exams may be retired, but the underlying skills remain useful.

HTML5 Structure and Semantics

• Create valid document structure and metadata.
• Use semantic elements such as header, nav, main, article, section, and footer.
• Build accessible forms with labels, validation, and appropriate input types.
• Use audio, video, canvas, and scalable graphics when suitable.
• Apply accessible names, keyboard support, and meaningful document order.

CSS Layout and Presentation

• Understand the cascade, inheritance, specificity, and source order.
• Use the box model, positioning, Flexbox, and Grid.
• Create responsive layouts with media queries.
• Style interactive states without removing accessibility indicators.
• Use transitions and animations appropriately.

JavaScript Fundamentals

• Work with variables, functions, arrays, objects, and modules.
• Select and update DOM elements.
• Handle events and form input.
• Use promises and async operations.
• Validate data and handle errors.
• Store suitable client-side data while respecting security and privacy.

Web Application Quality

Test across browsers and screen sizes. Review performance, accessibility, security, error handling, and maintainability. Avoid placing secrets in client-side code and never trust browser input without server-side validation.

Study Approach

1. Build a semantic page without a framework.
2. Create a responsive layout with Grid and Flexbox.
3. Add an accessible form and client-side validation.
4. Fetch data from an API and display errors clearly.
5. Inspect the result using browser developer tools.

Certification Note

Older HTML5 certification objectives may no longer represent a current exam. Always confirm the active certification path and skills outline using official documentation before preparing.

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