Can You Answer These HTML, CSS & JS 2026?

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Web development interviews in 2026 focus on clear fundamentals and practical understanding. Interviewers expect candidates to explain concepts briefly, write clean code, and understand how things work in real projects.

This guide covers:

👉 If you want topic-wise deep preparation, check these internal resources:

HTML interview concepts & basics: https://makemychance.com/?s=html
CSS fundamentals, box model & layouts: https://makemychance.com/?s=css
JavaScript interview preparation: https://makemychance.com/?s=javascript

More trusted references:

MDN Web Docs (HTML, CSS, JS): https://developer.mozilla.org
Web.dev (modern performance & best practices): https://web.dev

This guide covers:

HTML, CSS, JavaScript questions with short answers and code examples

Separate sections for Freshers and Experienced developers
A quick MCQ section for revision

Web development interviews in 2026 focus on clear fundamentals and practical understanding. Interviewers expect candidates to explain concepts briefly, write clean code, and understand how things work in real projects.

HTML Interview Questions

For Freshers (1–8)

1. What is Semantic HTML?

Semantic HTML uses meaningful tags to describe content.

HTML

<article>
  <h1>Title</h1>
  <p>Content</p>
</article>

<article>
  <h1>Title</h1>
  <p>Content</p>
</article>

2. Difference between `<div>` and `<section>`?

<section> has meaning, <div> does not.

3. What is the use of `doctype`?

It tells the browser which HTML version to use.

HTML

<!DOCTYPE html>

<!DOCTYPE html>

4. What are meta tags?

They provide page information like charset and viewport.

HTML

<meta name="viewport" content="width=device-width, initial-scale=1">

<meta name="viewport" content="width=device-width, initial-scale=1">

5. What is lazy loading?

Loading images only when needed.

HTML

<img src="img.jpg" loading="lazy">

<img src="img.jpg" loading="lazy">

6. Difference between inline and block elements?

Block starts on a new line, inline does not.

7. What are ARIA attributes?

They improve accessibility.

HTML

<button aria-label="Close">X</button>

<button aria-label="Close">X</button>

8. What is the `<picture>` tag?

Used for responsive images.

For Experienced (9–15)

9. Difference between `async` and `defer`?

defer runs after HTML parsing.

HTML

<script src="app.js" defer></script>

<script src="app.js" defer></script>

10. What is CORS?

A browser security rule for cross-origin requests.

11. Cookies vs localStorage?

Cookies go to server, localStorage stays in browser.

12. What are Web Components?

Reusable custom HTML elements.

13. How does accessibility impact SEO?

Accessible pages rank better.

14. What is preload?

Loads critical resources early.

HTML

<link rel="preload" as="style" href="style.css">

<link rel="preload" as="style" href="style.css">

15. HTML performance best practices?

Use semantic tags, lazy loading, and optimized assets.

CSS Interview Questions

For Freshers (16–23)

16. What is the CSS Box Model?

Content, padding, border, margin.

17. Difference between `display: none` and `visibility: hidden`?

display: none removes layout space.

18. What is Flexbox?

One-dimensional layout system.

CSS

.container {
 display: flex; 
 }

.container {
 display: flex; 
 }

19. Flexbox vs Grid?

Grid is two-dimensional.

20. What is responsive design?

Layouts that adapt to screen size.

21. What are media queries?

Apply styles based on device width.

CSS

@media (max-width: 768px) { }

@media (max-width: 768px) { }

22. em vs rem?

rem depends on root font size.

23. What is z-index?

Controls stacking order.

For Experienced (24–30)

24. What are Container Queries?

Style based on parent size.

CSS

@container (min-width: 400px) { }

@container (min-width: 400px) { }

25. What is `content-visibility`?

Improves rendering performance.

26. What are CSS Cascade Layers?

Manage priority using @layer.

27. How do you optimize CSS?

Remove unused CSS and avoid deep selectors.

28. What is specificity?

Rules deciding which style wins.

29. What are CSS variables?

Reusable values.

CSS

:root { --main: red; }

:root { --main: red; }

30. position: sticky?

Acts as relative until scroll.

JavaScript Interview Questions

For Freshers (31–38)

31. var vs let vs const?

They differ by scope.

32. What is hoisting?

Declarations move to top.

33. What is a closure?

Function with preserved outer scope.

JavaScript

function outer(){ 
let x=1;
return ()=>x;
 }

function outer(){ 
let x=1;
return ()=>x;
 }

34. == vs ===?

=== checks type and value.

35. What is the DOM?

Browser representation of HTML.

36. What are promises?

Handle async operations.

37. async/await?

Cleaner promise handling.

38. null vs undefined?

null is intentional.

For Experienced (39–45)

39. What is event delegation?

Single handler for multiple elements.

40. What is the event loop?

Manages async execution.

41. What is debouncing?

Limits function calls.

42. What is throttling?

Runs at fixed intervals.

43. What is memory leak?

Unused memory not released.

44. What is optional chaining?

Safe property access.

JavaScript

user?.profile?.name

user?.profile?.name

45. What is destructuring?

Extract values from objects.

JavaScript

const {name} = user;

const {name} = user;

MCQ Quick Revision

HTML MCQs

1. Which HTML tag is semantic and improves accessibility?

A. <div>
B. <span>
C. <article>
D. <b>

Correct Answer: C

2. Which attribute is used for lazy loading images?

A. async
B. defer
C. loading
D. fetch

Correct Answer: C

3. Which tag is best for navigation links?

A. <section>
B. <nav>
C. <header>
D. <aside>

Correct Answer: B

CSS MCQs

4. Which CSS layout system works in two dimensions?

A. Flexbox
B. Float
C. Grid
D. Inline-block

Correct Answer: C

5. Which property removes an element from the layout completely?

A. visibility: hidden
B. opacity: 0
C. display: none
D. z-index: -1

Correct Answer: C

6. Which unit is relative to the root element?

A. em
B. px
C. %
D. rem

Correct Answer: D

JavaScript MCQs

7. Which keyword cannot be reassigned?

A. var
B. let
C. const
D. function

Correct Answer: C

8. Which method converts JSON string to object?

A. JSON.stringify()
B. JSON.parse()
C. parseInt()
D. Object.parse()

Correct Answer: B

9. Which feature handles asynchronous code cleanly?

A. Callback
B. Promise
C. async/await
D. All of the above

Correct Answer: D

2. Which CSS layout system is two-dimensional?

A. Flexbox
B. Float
C. Grid
D. Inline-block

Correct Answer: C

3. Which JavaScript keyword cannot be reassigned?

A. var
B. let
C. const
D. function

Correct Answer: C

4. Which attribute delays script execution until HTML parsing is complete?

A. async
B. defer
C. preload
D. module

Correct Answer: B

5. Which CSS property removes an element from the layout completely?

A. visibility: hidden
B. opacity: 0
C. display: none
D. z-index: -1

Correct Answer: C

Final Thoughts

Mastering HTML, CSS, and JavaScript fundamentals is the key to clearing web development interviews in 2026. Focus on concept clarity, short coding examples, and practical scenarios.

Use this guide to:

Revise freshers and experienced-level questions
Practice MCQs for quick screening tests
Strengthen your knowledge with internal links on Makemychance
Refer to external trusted resources like MDN and Web.dev

Remember, frameworks like React or Node.js are important, but interviewers first test your core understanding. Consistent practice and revisiting these concepts will give you an edge in both written tests and live interviews.

Arsalan

Arsalan Malik is a passionate Software Engineer and the Founder of Makemychance.com. A proud CDAC-qualified developer, Arsalan specializes in full-stack web development, with expertise in technologies like Node.js, PHP, WordPress, React, and modern CSS frameworks.

He actively shares his knowledge and insights with the developer community on platforms like Dev.to and engages with professionals worldwide through LinkedIn.

Arsalan believes in building real-world projects that not only solve problems but also educate and empower users. His mission is to make technology simple, accessible, and impactful for everyone.