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>



<p><strong>Why it matters:</strong> Semantic tags improve accessibility and help search engines understand your content better.</p>


<hr>

<h3>
  
  
  2. <strong>What is the difference between id and class attributes?</strong>
</h3>

<ul>
<li>
id: Unique identifier, used once per page.</li>
<li>
class: Can be reused multiple times for styling or grouping elements.</li>
</ul>

<p><strong>Example:</strong><br>
</p>

<pre class="brush:php;toolbar:false"><!-- Using id -->
<div>



<p><strong>Pro Tip:</strong> Use id for unique elements like headers or footers, and class for reusable components.</p>


<hr>

<h3>
  
  
  3. <strong>What are void elements in HTML?</strong>
</h3>

<p>Void elements are self-closing and don’t have a closing tag.</p>

<p><strong>Examples:</strong><br>
</p>

<pre class="brush:php;toolbar:false"><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>



<p><strong>Pro Tip:</strong> Use inline-block for layouts where you need elements side-by-side with specific dimensions.</p>


<hr>

<h3>
  
  
  7. <strong>What are data attributes in HTML?</strong>
</h3>

<p>Custom attributes to store extra data without cluttering your DOM.</p>

<p><strong>Example:</strong><br>
</p>

<pre class="brush:php;toolbar:false"><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 and tags?

• : Defines a relationship between the document and an external resource (like CSS).
• : Creates a hyperlink.

<!-- 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>



<p><strong>Why it matters:</strong> Semantic tags improve accessibility and help search engines understand your content better.</p>


<hr>

<h3>
  
  
  2. <strong>What is the difference between id and class attributes?</strong>
</h3>

<ul>
<li>
id: Unique identifier, used once per page.</li>
<li>
class: Can be reused multiple times for styling or grouping elements.</li>
</ul>

<p><strong>Example:</strong><br>
</p>

<pre class="brush:php;toolbar:false"><!-- Using id -->
<div>



<p><strong>Pro Tip:</strong> Use id for unique elements like headers or footers, and class for reusable components.</p>


<hr>

<h3>
  
  
  3. <strong>What are void elements in HTML?</strong>
</h3>

<p>Void elements are self-closing and don’t have a closing tag.</p>

<p><strong>Examples:</strong><br>
</p>

<pre class="brush:php;toolbar:false"><img src="image.jpg" alt="A beautiful view">
<input type="text" placeholder="Enter your name">
<hr>

   <button onclick="alert('Hello!')">Click Me</button>