How do you embed a video using HTML5?

• Answer: You use the `

How can you handle different browser compatibility issues with HTML5?

• Answer: Techniques include using feature detection (checking if a browser supports a specific feature before using it), progressive enhancement (building a basic, functional website that works in older browsers and then adding enhanced features for modern browsers), polyfills (providing JavaScript code that emulates HTML5 features in older browsers), and using a CSS reset or normalize.css to minimize styling differences across browsers.

Explain the use of the `` element.

• Answer: The `` element provides a blank rectangular area where you can draw graphics using JavaScript. It's used for creating animations, games, charts, and other visual content dynamically.

What are Web Workers and how are they used?

• Answer: Web Workers allow you to run JavaScript code in the background, separately from the main browser thread. This prevents blocking the user interface while performing long-running tasks, such as complex calculations or large data processing, improving responsiveness.

What is the difference between localStorage and sessionStorage?

• Answer: Both `localStorage` and `sessionStorage` allow you to store data in the user's browser. `localStorage` persists even after the browser is closed and reopened, while `sessionStorage` is only available for the duration of the browser session and is cleared when the browser is closed.

Explain the use of the `data-*` attributes.

• Answer: `data-*` attributes allow you to store custom data private to the page or application. They start with `data-` followed by a descriptive name (e.g., `data-product-id`, `data-user-name`). This data can then be accessed using JavaScript to enhance functionality without relying on non-semantic attributes.

Describe your experience with responsive web design.

• Answer: [Describe your specific experience with responsive design techniques, mentioning frameworks like Bootstrap or Foundation, media queries, fluid grids, and flexible images. Give concrete examples from past projects.]

How have you used HTML5 features to improve website performance?

• Answer: [Discuss specific examples, such as using lazy loading for images, efficient use of caching, optimizing images, minimizing HTTP requests, and using efficient JavaScript practices. Mention specific techniques and tools used.]

What are some common HTML5 validation errors and how do you troubleshoot them?

• Answer: [List common errors such as missing closing tags, incorrect nesting, invalid attribute values, and unclosed quotes. Explain how you use browser developer tools, validators (e.g., W3C validator), and error messages to identify and fix these errors.]