How to embed a video in HTML5 without external plugins
· HTML & CSS
Learn how to use the HTML5 video element with multiple source formats, captions, and fallback content for broad browser support.
Category: HTML & CSS
68 questions in HTML & CSS.
What is the purpose of the HTML DOCTYPE declaration?
· HTML & CSS
Understand why the DOCTYPE declaration is required, how it affects browser rendering modes, and what happens if you omit it.
How to use HTML data attributes to store extra information
· HTML & CSS
Learn how to use HTML5 data attributes to embed custom data in your markup for JavaScript access and CSS styling.
What is ARIA and how does it improve web accessibility?
· HTML & CSS
Discover what ARIA roles, states, and properties are, and how they bridge accessibility gaps when semantic HTML alone is not enough.
How to optimize meta tags for SEO in HTML
· HTML & CSS
Learn how to write effective meta tags including title, description, Open Graph, and viewport settings to improve search visibility.
What is the difference between the id and class attributes in HTML?
· HTML & CSS
Understand the key differences between HTML id and class attributes, their use cases, and when to apply each in your markup.
How to create an accessible HTML form
· HTML & CSS
A practical guide to building accessible HTML forms with proper labels, ARIA attributes, and keyboard navigation support.
What are semantic HTML tags and why should you use them?
· HTML & CSS
Learn what semantic HTML tags are, how they improve accessibility and SEO, and why they matter for modern web development.