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FebTop 50 HTML Interview Questions and Answers
HTML Interview Questions and Answers
In this HTML tutorial, I’ll walk you through common HTML interview questions and answers to help you prepare effectively. Don’t worry. We’ll keep it simple and easy to follow! Ready to boost your confidence and ace that interview? Let’s get started!
HTML Interview Questions & Answers for Beginners
1. What is HTML?
HTML stands for Hypertext Markup Language. It is the standard markup language used to create and design web pages. By using HTML, you can structure your web pages and specify how the content should appear when displayed on the browser. It essentially serves as the backbone of any website.
2. What is !DOCTYPE?
A DOCTYPE, short for document type declaration, informs the web browser about the version of HTML used in the web page. In HTML5, the DOCTYPE declaration is case-insensitive and has a simple syntax as shown below:
<!DOCTYPE html>
3. What is the current version of HTML?
The latest version of HTML is HTML5, which introduces new features such as semantic elements, multimedia support, and enhanced performance. You can explore more about it here.
4. What are the different markup languages available?
Here are some popular markup languages:
- HTML: Hypertext Markup Language
- KML: Keyhole Markup Language
- SGML: Standard Generalized Markup Language
- MathML: Mathematical Markup Language
- XML: eXtensible Markup Language
- XHTML: eXtensible HyperText Markup Language
5. What are HTML tags?
HTML tags are the building blocks of any HTML document. They define elements and attributes and are generally used in pairs. The opening tag marks the start, and the closing tag marks the end. Tags are enclosed within <
and >
, making them easy to identify.
6. What are attributes in HTML?
Attributes in HTML provide extra information about an element, andinput attributesare specifically used to define various properties of form input elements.These attributes are always included in the opening tag and consist of a name and a corresponding value. For example, the style attribute can define the color of the text within an input field.
7. What are the main components of an HTML document?
The key components of an HTML document include:
- Tags: Define the elements
- Attributes: Provide additional details
- Content: Visible text or multimedia
- Comments: Non-visible notes for developers
8. Explain the difference between HTML elements and HTML tags.
HTML Elements | HTML Tags |
HTML elements define the structure and content of a web page. | HTML tags are used to mark up the beginning and end of an element. |
They consist of opening tags, content, attributes, and comments. | Tags are enclosed in angle brackets and have names like <div> or <p> . |
9. What is the difference between <div> and <span> elements?
The <div> element is a block-level element used for grouping and structuring content, while the <span> element is an inline element used for styling specific parts of the content.
<div>
<h2>Section Title</h2>
<p>This is a paragraph within a div element.</p>
</div>
Example of <span> usage:
<p>This is a <span style="color: blue;">blue</span> text.</p>
10. What is the purpose of HTML in web development?
The primary purpose of HTML is to provide a framework for structuring web pages. It organizes content using elements, tags, and attributes, making it possible for browsers to render pages in a user-friendly format. Without HTML, creating interactive and visually appealing websites would not be possible.
11. How do you create a hyperlink in HTML?
<a href="https://www.example.com">Link Text</a>
<a href="https://www.google.com">Visit Google</a>
12. Explain the difference between <strong> and <em> tags.
<strong>Important Text</strong>
<em>Emphasized Text</em>
13. What is the structure of an HTML tag?
<tagname>Content</tagname>
<p>This is a paragraph.</p>
14. How are comments added in HTML?
<!-- This is a comment -->
- Single-line comment: Used for brief notes.
- Multi-line comment: Used for detailed explanations.
15. What is the use of the alt attribute in images?
<img src="example.jpg" alt="A descriptive text about the image">
16. Describe various HTML tags used to display a table.
- <table>: This tag is used to define a table.
- <tr>: It is used to define a row in the table.
- <th>: It defines a header cell, usually displayed in bold and centered.
- <td>: This tag defines a standard cell in the table.
- <caption>: It provides a title or caption for the table.
- <colgroup>: It groups columns for applying styles or properties.
- <col>: It specifies column properties when used with <colgroup>.
- <thead>: It groups the header content in the table.
- <tbody>: It groups the body content in the table.
- <tfoot>: It defines the footer content in the table.
Tables help you organize data neatly, making it easier for users to interpret information.
17. What are the different types of lists in HTML?
- Unordered List (<ul>): This type of list uses bullet points to display items.
- Ordered List (<ol>): It organizes items in a specific sequence, usually with numbers or letters.
- Definition List (<dl>): This list displays items like a dictionary, with terms and their definitions.
Lists are essential for structuring information, improving readability, and enhancing user experience.
18. What are the various levels of heading tags?
- <h1>: This is the highest level, usually used for main titles. It grabs the most attention.
- <h2>: Use this for subheadings under the main title.
- <h3>: This is often used for smaller sections or subtopics.
- <h4>, <h5>, and <h6>: These are for less important headings or minor subsections.
Using heading tags helps search engines and users understand the structure of your content better.
19. What is the difference between HTML and HTML5?
HTML | HTML5 |
Stores temporary data in cookies. | Supports offline storage in SQL databases and application cache. |
Does not support running JavaScript in the browser. | With the Web Worker API, JavaScript can run in the browser. |
Compatible with older browsers. | Designed for modern browsers like Chrome, Firefox, and Safari. |
Lacks attributes like charset, async, and ping. | Includes these and many other attributes. |
HTML5 introduces more features and functionalities, making it ideal for modern web development.
20. What is the purpose of the <img> tag in HTML?
- src: Specifies the image's source URL.
- alt: Provides alternate text that appears if the image cannot load. It also helps with accessibility and SEO.
The <img> tag is self-closing, meaning it does not need a separate closing tag.
<img src="example.jpg" alt="Example Image">
21. What is the purpose of the <form> element in HTML?
<form action="/submit" method="post">
<label>Username: <input type="text" name="username"></label><br>
<label>Password: <input type="password" name="password"></label><br>
<input type="submit" value="Submit">
</form>
22. What are HTML entities? Provide an example.
23. Explain the difference between the GET and POST methods in HTML forms.
GET | POST |
The 'GET' method sends form data as part of the URL query string. | The 'POST' method sends form data within the HTTP request body. |
The data length is limited in 'GET'. | 'POST' handles larger amounts of data. |
The data is visible to the user in the 'GET' method. | The data is hidden from the user in the 'POST' method. |
24. What is the purpose of the <meta> tag in HTML?
25. How do you create a numbered list in HTML?
<ol>
<li>First item</li>
<li>Second item</li>
<li>Third item</li>
</ol>
HTML Interview Questions and Answers for Intermediate
26. Explain the difference between the <header>, <nav>, <main>, and <footer> elements.
- <header>: It contains introductory content or navigation links for a section or the entire page.
- <nav>: It is used to define navigation links to other pages or sections within the same page.
- <main>: It holds the main content of the webpage, excluding headers, footers, and navigation.
- <footer>: This element is used to include information like copyright, author details, or footer-related content.
27. Explain the difference between inline elements and block-level elements in HTML.
Inline Elements | Block-Level Elements |
Inline elements don’t start on a new line and flow within the text. | Block-level elements begin on a new line and take up the full width of their container. |
Inline elements don't have top and bottom margins. | Block-level elements have top and bottom margins. |
Examples: <span>, <a>, <strong>. | Examples: <div>, <p>, <h1>..<h6>. |
Read More: HTML Inline and Block Elements: Explained with Examples
28. What is the purpose of the viewport meta tag?
<meta name="viewport" content="width=device-width, initial-scale=1">
29. What is the difference between <div> and <span> in HTML?
<div> | <span> |
The <div> tag is a block-level element used to group larger sections of content. | The <span> tag is an inline element used to style or target smaller chunks of text or content. |
The <div> tag takes up the full width of its container and starts on a new line. | The <span> tag does not start on a new line and only takes up as much space as its content. |
<div> is used for layout purposes or when you need to wrap larger sections. | <span> is typically used for styling small sections of text or other inline elements. |
30. How do you embed an image in HTML?
<img src="image.jpg" alt="A beautiful scenery">
31. What are data attributes in HTML?
32. Explain the difference between HTML and XHTML.
HTML | XHTML |
HTML stands for HyperText Markup Language. | XHTML stands for eXtensible HyperText Markup Language. |
HTML is more forgiving with syntax, allowing shorthand notations. | XHTML follows strict XML rules, requiring all elements to be properly nested and closed. |
HTML allows rendering even with minor syntax issues. | In XHTML, even small syntax errors can lead to parsing failures, preventing the document from rendering. |
HTML structure is lenient. | XHTML adheres strictly to XML document structure rules. |
HTML is compatible with most web browsers. | XHTML has stricter syntax rules, making it less compatible with older browsers. |
HTML is widely used in general web development. | XHTML is commonly used where strict XML compliance is required, such as in applications and web services. |
33. How do you embed audio and video in HTML?
- Audio: To embed audio in HTML, use the <audio> element with the src attribute to specify the audio file. You can also include optional controls like play, pause, and volume.
- Video: To embed video in HTML, use the <video> element with the src attribute to specify the video file. Similar to the audio element, the controls attribute allows users to control playback.
<audio controls>
<source src="audio.mp3" type="audio/mpeg">
</audio>
<video controls width="320" height="240">
<source src="video.mp4" type="video/mp4">
</video>
Read More: Media and Graphics in HTML |
34. What is the purpose of the <figure> and <figcaption> elements?
35. What is the purpose of the rel attribute in the <a> tag?
Example:
<a href="styles.css" rel="stylesheet">Link to stylesheet</a>
36. What is the purpose of the scoped attribute in the <style> tag?
<template>
<div>
<style scoped>
div { color: red; }
</style>
<div>This text will be red.</div>
</div>
</template>
37. What is the purpose of the <iframe> element?
38. How do you create a form with input fields in HTML?
Example:
<form action="/submit" method="post">
<label for="username">Username:</label>
<input type="text" id="username" name="username">
<input type="submit" value="Submit">
</form>
39. What is the difference between <script> and <noscript>?
Example:
<script>
alert("JavaScript is enabled!");
</script>
<noscript>
JavaScript is disabled. Please enable it to view the content.
</noscript>
40. What are semantic elements in HTML?
Example:
<header>
<h1>Welcome to My Website</h1>
</header>
<article>
<h2>Main Article</h2>
<p>This is the main content of the article.</p>
</article>
<footer>
<p>© 2025 My Website</p>
</footer>
HTML Interview Questions and Answers for Experienced
41. What are web components, and how do they differ from custom HTML elements?
- Custom Elements
- Shadow DOM
- HTML Templates
- HTML Imports
These technologies make web components highly modular and reusable, helping developers to create rich, self-contained UI components. Unlike traditional custom HTML elements, web components provide encapsulation and isolation, which means the component’s styles and behavior are shielded from external styles or scripts, offering better control and preventing conflicts.
42. Explain the differences between client-side rendering (CSR) and server-side rendering (SSR) in the context of web applications.
Client-Side Rendering (CSR) | Server-Side Rendering (SSR) |
Rendering occurs in the client's browser using JavaScript frameworks. | Rendering occurs on the server before sending HTML to the client. |
The initial load time is longer as rendering occurs after HTML is sent to the client. | The initial time is shorter as pre-rendered HTML is sent to the client. |
It is less SEO-friendly. | It is more SEO-friendly. |
The performance depends on the browser support for JavaScript and modern APIs. | Its performance is consistent across browsers. |
The complexity level is higher due to managing client-side state and routing. | It is less complex as the server handles rendering and data fetching. |
43. What are the new semantic elements introduced in HTML5?
- <header>
- <nav>
- <main>
- <section>
- <article>
These elements give a clearer structure to your web document, improving readability for both users and search engines. Using semantic elements not only helps with SEO but also provides a more accessible web experience.
44. How can you ensure accessibility in HTML documents?
- Use semantic HTML elements to provide a logical structure and meaningful content hierarchy.
- Ensure all images, audio, and video elements have descriptive alt text to make them accessible to screen readers.
- Make sure keyboard navigation works well, enabling users to navigate the site without a mouse.
- Leverage ARIA (Accessible Rich Internet Applications) attributes to enhance accessibility for complex interactive elements.
- Regularly test your pages with screen readers and other assistive technologies to identify and resolve accessibility issues.
45. What are the best practices for optimizing web page performance in terms of HTML?
- Combine CSS and JavaScript files to reduce HTTP requests, using image sprites for efficient asset delivery.
- Use asynchronous loading for scripts and stylesheets to prevent blocking the page's rendering process.
- Remove unnecessary white spaces, comments, and duplicate attributes to minimize HTML file size.
- Implement lazy loading for images and other resources, ensuring they only load when needed.
- Utilize browser caching and compression techniques to improve load times and reduce file sizes.
46. Explain the differences between client-side rendering (CSR) and server-side rendering (SSR) in the context of web applications.
- Client-side rendering (CSR) means the browser renders the content by executing JavaScript frameworks like React or Angular. The server sends raw HTML and JavaScript bundles, and rendering happens in the browser.
- Server-side rendering (SSR) renders the content on the server and sends fully rendered HTML to the client. This improves performance and SEO, especially for large websites with heavy content.
47. What are web components, and how do they differ from custom HTML elements?
- Custom Elements
- Shadow DOM
- HTML Templates
- HTML Imports
Unlike traditional custom HTML elements, web components offer strong encapsulation, meaning the styles and behavior are self-contained, preventing interference from external scripts and styles. This isolation makes it easier to develop complex, reusable UI components.
48. What are HTML imports, and how do they differ from traditional script and link tags?
<link rel="import" href="component.html">
49. Explain the difference between <pre> and <code> elements in HTML and when to use each.
Example:
<pre>
function greet() {
console.log("Hello, world!");
}
</pre>
<p>Use the <code>greet()</code> function to display a greeting.</p>
50. What is the purpose of the defer and async attributes in <script> tags?
- The defer attribute delays the execution of the script until the document is fully parsed, improving the page load speed. It’s used with external scripts and allows the script to download in parallel with page parsing.
- The async attribute makes the script load asynchronously, meaning it does not block the page rendering. However, it may cause issues if the order of script execution matters.
<script src="script.js" defer></script>
<script src="script.js" async></script>
Summary
HTML interview questions for experienced developers focus on advanced topics like web components, client-side vs server-side rendering, accessibility, and performance optimization. Mastering these concepts will enhance your ability to build efficient, accessible, and SEO-friendly web applications. To further enhance your skills, consider enrolling in the Frontend Foundation Certification Training here, or explore free courses on HTMLand JavaScript.
Test Your Knowledge of HTML Interview Questions!
Q 1: What does HTML stand for?
- (a) HyperText Markup Language
- (b) HomeTool Markup Language
- (c) HyperTool Markup Language
- (d) HyperText Modeling Language
Q 2: Which HTML element is used to display a picture?
- (a)
<img>
- (b)
<image>
- (c)
<picture>
- (d)
<photo>
Q 3: What is the correct HTML element for inserting a line break?
- (a)
<br>
- (b)
<break>
- (c)
<lb>
- (d)
<newline>
Q 4: How do you create a hyperlink in HTML?
- (a)
<a>link</a>
- (b)
<link>link</link>
- (c)
<hyperlink>link</hyperlink>
- (d)
<href>link</href>
Q 5: Which attribute is used to specify an alternative text for an image, if the image cannot be displayed?
- (a)
alt
- (b)
title
- (c)
src
- (d)
placeholder
FAQs
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