Hey there, frontend enthusiasts! 👋 Whether you're gearing up for your first interview or brushing up for your next big opportunity, mastering HTML is a must. Here's a curated list of the most common HTML interview questions with practical examples. Let's dive in! 🚀
1. What are semantic HTML tags?
Semantic tags clearly describe their purpose in a web page. They make your code more readable and improve SEO. 📝
Example:
<!-- Semantic -->
<header>
<h1>Welcome to My Blog</h1>
</header>
<article>
<h2>How to Code</h2>
<p>Start by learning the basics...</p>
</article>
<!-- Non-semantic -->
<div class="header">
<h1>Welcome to My Blog</h1>
</div>
<div class="content">
<h2>How to Code</h2>
<p>Start by learning the basics...</p>
</div>
Why it matters: Semantic tags improve accessibility and help search engines understand your content better.
2. What is the difference between id and class attributes?
-
id: Unique identifier, used once per page. -
class: Can be reused multiple times for styling or grouping elements.
Example:
<!-- Using id -->
<div id="main-header">Welcome!</div>
<!-- Using class -->
<div class="card">Card 1</div>
<div class="card">Card 2</div>
Pro Tip: Use id for unique elements like headers or footers, and class for reusable components.
3. What are void elements in HTML?
Void elements are self-closing and don’t have a closing tag.
Examples:
<img src="image.jpg" alt="A beautiful view">
<input type="text" placeholder="Enter your name">
<hr>
Fun Fact: Adding a closing tag to void elements is invalid HTML!
4. How do you include JavaScript in an HTML document?
There are three ways to include JavaScript:
1) Inline:
<button onclick="alert('Hello!')">Click Me</button>
2) Internal:
<script>
console.log('Hello from internal script!');
</script>
3) External:
<script src="script.js"></script>
Pro Tip: External scripts are preferred for better separation of concerns. 🛠️
5. What is the purpose of the alt attribute in images?
The alt attribute provides alternative text for an image when it’s not displayed or for screen readers.
Example:
<img src="logo.png" alt="Company Logo">
Why it’s important: Enhances accessibility and improves SEO ranking.
6. What are the differences between inline, block, and inline-block elements in HTML?
- Inline: Doesn’t start on a new line and only takes up as much width as necessary.
- Block: Starts on a new line and takes up the full width available.
- Inline-block: Behaves like an inline element but allows setting width and height.
Example:
<!-- Inline -->
<span>This is inline</span>
<span>Another inline</span>
<!-- Block -->
<div>This is block</div>
<div>Another block</div>
<!-- Inline-block -->
<div style="display: inline-block; width: 100px;">Inline-block 1</div>
<div style="display: inline-block; width: 100px;">Inline-block 2</div>
Pro Tip: Use inline-block for layouts where you need elements side-by-side with specific dimensions.
7. What are data attributes in HTML?
Custom attributes to store extra data without cluttering your DOM.
Example:
<button data-user-id="123" onclick="handleClick(this)">Click Me</button>
<script>
function handleClick(button) {
alert(`User ID: ${button.dataset.userId}`);
}
</script>
Why they’re handy: Great for passing data to JavaScript without hardcoding.
8. How can you make an HTML element accessible?
- Use proper semantic tags.
- Add
aria-*attributes for better screen reader support.
Example:
<button aria-label="Submit Form">Submit</button>
Pro Tip: Test your website with screen readers for real-world accessibility. 🌟
9. What’s the difference between <link> and <a> tags?
-
<link>: Defines a relationship between the document and an external resource (like CSS). -
<a>: Creates a hyperlink.
Example:
<!-- Link -->
<link rel="stylesheet" href="styles.css">
<!-- Anchor -->
<a href="https://dev.to">Visit DEV Community</a>
Quick Tip: Don’t confuse the two—one is for resources, the other for navigation!
10. What is the doctype declaration?
The <!DOCTYPE> declaration defines the HTML version used in the document.
Example:
<!DOCTYPE html>
<html>
<head>
<title>My Page</title>
</head>
<body>
<p>Hello, World!</p>
</body>
</html>
Fun Fact: Modern browsers default to HTML5 even if the doctype is missing, but it’s best to include it.
Quiz Time! 🎉
Let’s test your knowledge. Answer these in the comments below! 💬
- What tag would you use for defining a navigation menu?
- a)
<div> - b)
<nav> - c)
<section>
- Which attribute uniquely identifies an element in the DOM?
- a)
class - b)
id - c)
style
-
True or False: The
<img>tag is a semantic HTML tag.
Drop your answers below and let’s discuss! 🎯
Top comments (4)
For your comment on "Top HTML Interview Questions for Frontend Developers," you could write:
"Great list of essential HTML questions! These cover key concepts for any frontend developer to master for better performance and accessibility."
Thank you @ohmyposh ! I'm glad you found the list helpful.
it's really a high quality content for
htmlinterviewsthanks @paxnw