HTML5 Interview Questions and Answers for 5 years experience

1. What is HTML5 and what are its key features?

   • Answer: HTML5 is the fifth and current major version of HTML, the core markup language of the World Wide Web. Key features include: semantic elements (e.g., `
     `, `

2. Explain the difference between `DOCTYPE` and ``.

   • Answer: The `DOCTYPE` declaration isn't an HTML tag; it's an instruction to the web browser about which version of HTML the page is written in. It tells the browser to use the appropriate rendering mode. The `` tag is the root element of the HTML document; everything else is nested within it.

3. What are semantic HTML elements and why are they important?

   • Answer: Semantic HTML elements are tags that clearly describe their meaning to both the browser and developers. Examples include `
     `, `

4. Describe the difference between `inline`, `block`, and `inline-block` elements.

   • Answer: `inline` elements only take up as much width as necessary and do not start on a new line. `block` elements always start on a new line and take up the full width available. `inline-block` elements combine the features of both; they take up only as much width as needed but can be styled like block elements with things like margins and padding.

5. How do you use the `` element? Give a simple example.

   • Answer: The `` element provides a drawing surface that can be manipulated using JavaScript. You need to get a 2D rendering context using `getContext('2d')`. Then you can use methods like `fillRect()`, `strokeRect()`, `fillText()`, etc., to draw shapes and text. For example: ` JavaScript: `const canvas = document.getElementById('myCanvas'); const ctx = canvas.getContext('2d'); ctx.fillStyle = 'red'; ctx.fillRect(10, 10, 50, 50);`

6. Explain the purpose of the `

   • Answer: The `

7. What are Web Workers and how are they used?

   • Answer: Web Workers allow you to run JavaScript code in the background, separate from the main browser thread. This prevents the main thread from being blocked and improves responsiveness, especially for computationally intensive tasks. You create a worker using a `Worker` object and communicate with it using `postMessage()`.

8. How do you implement responsive design using HTML5?

   • Answer: Responsive design in HTML5 relies primarily on CSS. You use media queries (`@media`) to apply different styles depending on the screen size, device orientation, and other factors. The viewport meta tag (``) is crucial for proper scaling on mobile devices. Flexible layouts using percentage-based widths and fluid grids are also key.

9. What is the difference between `localStorage` and `sessionStorage`?

   • Answer: Both `localStorage` and `sessionStorage` provide ways to store key-value pairs in the user's browser. `localStorage` persists even after the browser is closed, while `sessionStorage` is cleared when the browser tab or window is closed.

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