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Introduction
If you’re starting your journey as a web developer, learning HTML, CSS, and JavaScript is a major step. These three languages form the foundation of front-end development. Understanding them helps you perform better in interviews and projects.
This blog covers 20 important interview questions for beginners. These questions test your basic knowledge and help you explain concepts clearly and confidently.
HTML Interview Questions
1. What is HTML and why is it important?
HTML stands for HyperText Markup Language. It creates the structure of web pages. Every website uses HTML to define layout and content.
2. What are semantic HTML tags?
Semantic tags explain the purpose of content. Tags like article, section, and footer improve page structure.
3. What is the difference between block-level and inline elements?
Block-level elements start on a new line and take up full width. Inline elements stay within the flow of text and use only needed space.
4. How does the alt attribute help in images?
The alt attribute describes an image when it cannot load. It supports screen readers and improves SEO.
5. What is the difference between id and class attributes?
The id attribute targets one unique element. The class attribute applies the same styles to multiple elements.
CSS Interview Questions
6. What is CSS and how does it work with HTML?
CSS stands for Cascading Style Sheets. It controls the design of web pages. CSS defines colors, fonts, and layouts.
7. What are the three types of CSS?
CSS can be used inline, internal, or external.
8. How does the box model work in CSS?
The box model treats every HTML element as a box. It includes content, padding, border, and margin.
9. What is the difference between relative, absolute, and fixed positioning?
Relative moves an element from its normal place. Absolute places it based on the nearest parent. Fixed keeps the element in place on the screen.
10. Why are media queries useful?
Media queries allow different styles on different screen sizes. They help create responsive designs.
JavaScript Interview Questions
11. What is JavaScript and why do developers use it?
JavaScript adds interactivity and logic to web pages. It supports dynamic features like forms, sliders, and updates.
12. What is the difference between var, let, and const?
Var has function scope. Let and const have block scope. Const variables cannot change after assignment.
13. What are the basic data types in JavaScript?
JavaScript has data types like string, number, boolean, undefined, null, object, and symbol.
14. What is the DOM and how does JavaScript interact with it?
The DOM is the Document Object Model. JavaScript accesses and modifies the structure of a webpage through the DOM.
15. What is an event in JavaScript?
An event is an interaction such as a click, scroll, or key press. JavaScript detects and handles these events using listeners.
16. How does == differ from === in JavaScript?
The == operator compares values with type conversion. The === operator compares value and type without conversion.
17. What is a function and why is it useful?
A function performs a specific task and can be reused. It makes code organized and efficient.
18. What is a callback function?
A callback function runs after another function completes. It is often used in asynchronous tasks.
19. How do arrays work in JavaScript?
Arrays store multiple values in one variable. You can access elements by index and use various operations on them.
20. What is the role of loops in JavaScript?
Loops repeat actions until a condition is met. They help process arrays and perform repetitive tasks.
Conclusion
Learning these HTML, CSS, and JavaScript questions prepares you for interviews. As a beginner, understanding the concepts is more important than memorizing answers. Practice and real projects help improve your skills.
Build simple projects using these concepts. This strengthens your understanding and supports your job preparation.
W3Schools – HTML and CSS Tutorials
FreeCodeCamp – Learn to Code for Free
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