Html, css, JavaScript: 17 MCQs with answers

Q1. What is the primary role of HTML in a web page?

Q2. How does CSS enhance the presentation of a web page beyond what HTML provides?

Q3. What is the function of JavaScript in a web browser?

Q4. Describe how an external CSS file is linked to an HTML document.

Q5. What is the purpose of the `alt` attribute in an HTML `<img>` tag?

Q6. How does the HTML `<meta>` tag contribute to web development?

Q7. Explain the concept of 'separation of concerns' as it applies to HTML, CSS, and JavaScript.

Q8. What is the DOM, and how does JavaScript interact with it?

Q9. How does an external JavaScript file get included in an HTML page, and what is the effect of the `defer` attribute?

Q10. What is the difference between inline, internal, and external CSS?

Q11. Give an example of how JavaScript can respond to a user event, such as a button click.

Q12. Explain the concept of CSS specificity and why it matters.

Q13. How does JavaScript's `document.querySelector()` method differ from `document.getElementById()`?

Q14. Describe the box model in CSS and its components.

Q15. What is the difference between `let`, `const`, and `var` in JavaScript?

Q16. Explain the purpose of the `display: flex` property in CSS.

Q17. What is an event in JavaScript, and how can you prevent its default behavior?