HTML is the backbone of every website, and a strong grip on its basics is still a must in 2025. Whether you’re a student, a beginner, or preparing for a web developer interview, HTML questions are asked in almost every round. Many interviewers focus on real-world understanding rather than bookish definitions. In this blog, we’ve covered the most important and commonly asked HTML interview questions with clear, simple answers. This guide will help you revise quickly and feel confident before your interview.
This blog will be regularly updated with new, interesting, and trending HTML interview questions. As interview patterns change, fresh questions and practical answers will be added here.
So feel free to bookmark it and come back whenever you need a quick revision or new questions.
HTML (Basics)
Q1. What is the basic structure of an HTML document?
The basic structure of an HTML document is the standard layout that tells the browser how to read and display a web page. It starts with <!DOCTYPE html> to define HTML5, followed by the <html> tag. Inside it, the <head> section holds the page title and meta information, while the <body> section contains all the visible content shown to users.
Q2.How do you create a hyperlink in HTML?
Hyperlinks in HTML are used to connect one web page to another or to a different section of the same page.
They are created using the <a> tag with the href attribute to define the link destination.
<a href="https://example.com">Visit Website</a>Q3. How do you display an image on a webpage in HTML?
In HTML, an image is added to a webpage using the <img> tag, where the src attribute points to the image file and the alt attribute describes the image for better accessibility and SEO.
Q4. What is the purpose of the DOCTYPE declaration?
The DOCTYPE declaration tells the browser which version of HTML the document is using. It helps the browser render the page correctly by following standard rules
In HTML5, <!DOCTYPE html> ensures consistent behavior across different browsers.
Q5. How many types of lists are there in HTML?
There are three types of lists in HTML: ordered lists (<ol>), unordered lists (<ul>), and description lists (<dl>).
Q6. What are HTML entities, and how are they used?
HTML entities are special codes used to display reserved characters or symbols that cannot be written directly in HTML.
They start with & and end with ;, such as < for < and & for &.
Elements & Tags
Q1. What is the difference between an HTML tag and an HTML element?
An HTML tag is just the markup like <p>, while an HTML element includes the tag, its content, and attributes like <p class=”text”>Hello</p>.
Q2. Are HTML tags case-sensitive?
No, HTML tags are not case-sensitive, but writing them in lowercase is considered best practice for clean and consistent code.
Q3. What are empty (void) elements in HTML?
Void elements in HTML are elements that do not have closing tags or content, such as <img>, <br>, <hr>, and <input>.
Q4. What is a marquee in HTML?
A marquee in HTML is a tag used to create scrolling text or images on a web page (now considered outdated).
Q5. Inline and block elements in HTML5?
Inline elements are used to format or style small parts of content within a line. They do not start on a new line and only take up as much space as their content requires. Common examples of inline elements include <span>, <a>, <strong>, and <em>. Inline elements are mostly used for text-level styling and links.
Block elements are used to structure the layout of a web page. They always start on a new line and take up the full width available. Examples of block elements include <div>, <p>, <h1> to <h6>, and <section>. Block elements help in organizing content into clear, readable sections.
Attributes
What are HTML attributes?
Attributes in HTML provide extra information about an element and control how it behaves or appears.
They are written inside the opening tag and usually come as name–value pairs.
For example, href in a link or src in an image tag is an attribute.
Explain the difference between id and class attributes.
The id attribute is used to uniquely identify a single HTML element on a page. No two elements can share the same id. It is commonly used when you need to target one specific element, such as for JavaScript actions or page anchors.
The class attribute is used to group multiple elements together. The same class name can be applied to many elements, making it ideal for styling or applying common behavior using CSS or JavaScript.
What is the role of the title attribute in HTML?
The title attribute provides extra information about an element, usually shown as a tooltip when the user hovers over it. It helps give additional context to users.
What is the role of the alt attribute in the `<img>` tag?
The alt attribute provides alternative text for an image if it fails to load.
It also helps screen readers understand the image content, improving accessibility.
Is the order of attributes inside an HTML tag important?
No, the order of attributes does not matter. The browser reads all attributes the same way, no matter how they are arranged.
What happens if you use an attribute that is not valid for an HTML element?
The browser usually ignores the invalid attribute. It does not break the page but has no effect.
What are some commonly used HTML attributes?
Common attributes include id, class, style, src, href, alt, and title. They help with styling, linking, and accessibility.
What is the difference between global attributes and specific attributes?
Global attributes can be used on almost all HTML elements, like id and class. Specific attributes work only with certain tags, like src for <img>.
Can an attribute exist without a value? Give an example.
Yes, some attributes work without values. For example, disabled in <button disabled>.
What happens if you repeat the same attribute twice in one HTML element?
The browser usually considers the last attribute value and ignores the earlier one.
Are HTML attribute values case-sensitive?
In most cases, attribute values are not case-sensitive. However, some values like file paths and IDs can be case-sensitive depending on usage.
HTML CSS
How do you add CSS styling in HTML?
1. Inline CSS
Inline CSS is written directly inside an HTML element using the style attribute. It is useful for quick, small changes.
Example: <p style=”color: blue; font-size: 16px;”>Hello World</p>
2. Internal CSS
Internal CSS is added inside a <style> tag within the <head> section of the HTML file. It is good for styling a single page.
Example: <style> p { color: green; } </style>
3. External CSS
External CSS is written in a separate .css file and linked to the HTML document. It is best for large websites and reuse.
Example: <link rel=”stylesheet” href=”style.css”>
What is the hierarchy that is followed in stylesheets?
The stylesheet hierarchy follows this order: Inline CSS → Internal CSS → External CSS → Browser default styles.
How do you create a responsive layout using HTML?
A responsive layout in HTML is created by using a proper page structure and semantic elements.
The viewport meta tag helps the page adjust to different screen sizes.
Flexible layouts like percentage widths, Flexbox, or Grid make content adapt automatically.
Media queries are used to change the layout based on device screen size.
This blog will be regularly updated with new, interesting, and trending HTML interview questions. As interview patterns change, fresh questions and practical answers will be added here.
So feel free to bookmark it and come back whenever you need a quick revision or new questions.
