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Interview Questions

Q.1 What is the purpose of HTML, and how is it different from CSS and JavaScript?

HTML is for structuring content, CSS for styling, and JavaScript for interactivity. HTML provides the skeleton, CSS the appearance, and JavaScript the behavior.

Q.2 Explain the box model in CSS.

The box model defines how elements are structured in terms of content, padding, border, and margin.

Q.3 How do you center an element horizontally and vertically using CSS?

Use margin: auto; for horizontal centering and a combination of position: absolute; and transform: translate(-50%, -50%); for vertical centering.

Q.4 What is semantic HTML, and why is it important?

Semantic HTML adds meaning to the content structure, making it more understandable by both browsers and developers. It improves accessibility and SEO.

Q.5 Explain the difference between == and === in JavaScript.

== checks for equality after type coercion, while === checks for equality without type coercion (strict equality).

Q.6 How does the \"this\" keyword work in JavaScript?

\"this\" refers to the current execution context. In a global scope, it refers to the global object; inside a function, it refers to the object that invoked the function.

Q.7 What is the purpose of the defer attribute in script tags?

The defer attribute ensures that the script is executed after the HTML is parsed, helping in maintaining the document\'s loading performance.

Q.8 How do you include external JavaScript libraries, such as jQuery, in a project?

Use the .

Q.9 Explain event delegation in JavaScript.

Event delegation involves assigning a single event listener to a common ancestor instead of attaching listeners to individual elements. This is useful for dynamically added elements.

Q.10 What is the purpose of CSS media queries, and how do they work?

Media queries allow styles to be applied based on device characteristics. They use the @media rule to conditionally apply CSS rules.

Q.11 How can you optimize a website\'s performance?

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Q.12 Explain the purpose of the viewport meta tag in HTML.

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Q.13 What is the \"box-sizing\" property in CSS, and how does it affect layout?

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Q.14 How do you handle cross-browser compatibility issues in web development?

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Q.15 Explain the concept of responsive web design.

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Q.16 What is the purpose of the \"z-index\" property in CSS?

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Q.17 How do you make a website accessible to users with disabilities?

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Q.18 Explain the purpose of the \"localStorage\" and \"sessionStorage\" in JavaScript.

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Q.19 How can you optimize website loading speed?

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Q.20 Explain the concept of closures in JavaScript.

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Q.21 How does the \"display: flex\" property work in CSS for layout?

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Q.22 What is the purpose of the \"pointer-events\" property in CSS?

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Q.23 How do you implement a smooth scrolling effect on a website?

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Q.24 Explain the purpose of the \"async\" and \"defer\" attributes in script tags.

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Q.25 How do you handle browser storage limits when using \"localStorage\"?

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Q.26 What is the purpose of the \"content\" property in CSS?

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Q.27 How do you implement lazy loading for images on a website?

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Q.28 Explain the \"same-origin policy\" in the context of web security.

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Q.29 How do you organize your CSS for larger projects to avoid code redundancy?

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Q.30 What is the purpose of the \"fetch\" API in JavaScript, and how does it differ from \"XMLHttpRequest\"?

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Q.31 How can you ensure a website is optimized for SEO?

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Q.32 Explain the concept of \"event bubbling\" in JavaScript.

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Q.33 What is the purpose of the \"box-shadow\" property in CSS?

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Q.34 How do you handle responsive images for different screen resolutions?

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Q.35 Explain the concept of \"callback functions\" in JavaScript.

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Q.36 How do you implement a sticky header in CSS?

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Q.37 What is the purpose of the \"viewport\" meta tag in responsive web design?

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Q.38 How can you optimize website accessibility for users with visual impairments?

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Q.39 Explain the concept of \"event delegation\" in jQuery.

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Q.40 How can you prevent the default behavior of an HTML form submission using JavaScript?

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Q.41 What is the purpose of the \"transition\" property in CSS?

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Q.42 Explain the purpose of the \"JSON.stringify()\" and \"JSON.parse()\" methods in JavaScript.

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Q.43 How do you implement a carousel/slider using HTML, CSS, and JavaScript?

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Q.44 What are CSS pre-processors, and why might you use one like Sass or Less?

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Q.45 Explain the purpose of the \"localStorage\" and \"sessionStorage\" in web storage.

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Q.46 How do you handle browser compatibility issues when using JavaScript?

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Q.47 Explain the concept of \"event capturing\" in JavaScript.

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Q.48 What are the benefits of using a CSS pre-processor like Sass?

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Q.49 How do you optimize a website for mobile devices?

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Q.50 Explain the role of AJAX in web development.

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