Html Css Javascript Interview Questions For Freshers
Top 10 HTML, CSS, and JavaScript Interview Questions for Freshers
HTML, CSS, and JavaScript are the three fundamental languages used for building websites and web applications. As a fresher, you may be asked a variety of questions related to these languages during an interview. Some common questions for HTML may include the basic structure of an HTML document, the difference between HTML and HTML5, and the role of HTML in web development. For CSS, you may be asked about the different types of CSS selectors, the box model, and the concept of cascading. JavaScript questions may cover topics such as data types, functions, and event handling. It is important to have a good understanding of these languages, as well as hands-on experience with building simple web projects, to succeed in a web development interview.
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1 - What is semantic HTML and why is it important?
Semantic HTML is the use of HTML tags that accurately describe the content they contain. This makes websites more readable for both humans and search engines, making the website easier to understand and navigate.
2) What is the difference between class and id in CSS?
An id is used to uniquely identify a specific HTML element, while a class is used to group multiple elements that share the same style or function. There can be only one id per element, but multiple classes can be applied to a single element.
3) How do you center an element horizontally and vertically in CSS?
To center an element horizontally, use the “text align: center;” property on its parent element. To center an element vertically, use “display: flex;” and “align items: center;” on the parent element, then use “margin: auto;” on the child element.
4) What is the difference between == and === operators in JavaScript?
The == operator checks for equality of value only, while the === operator checks for equality of both value and datatype.
5) What is a closure in JavaScript?
A closure is a function that has access to variables in its outer function, even after the outer function has returned. This allows for persistent data to be stored, making closures useful for creating private variables and implementing the module pattern.
6) How do you declare a variable in JavaScript?
Variables are declared using the “var”, “let”, or “const” keywords. “Var” and “let” allow for the variable to be reassigned a new value, while “const” declares a variable whose value cannot be changed.
7) What is a CSS preprocessor and why would you use one?
A CSS preprocessor is a tool used to generate CSS from a higher level scripting language. It allows for the use of variables, functions, mixins, and nested syntax, making CSS more maintainable and efficient.
8) How do you clear a float in CSS?
To clear a float, use the “clear: both;” property on an element after the floated elements.
9) What is the box model in CSS?
The box model describes the layout of an element on a web page. It consists of the content, padding, border, and margin. Each component affects the overall size of the element and can be customized using CSS.
10) What is the difference between margin and padding in CSS?
Margin is the space outside an element, while padding is the space inside an element. Margin affects the spacing between elements, while padding affects the spacing within an element.
11) What is a callback function in JavaScript?
A callback function is a function passed as an argument to another function and is intended to be called at a later time. It is commonly used in asynchronous programming to handle data once it has been received.
12) What is the purpose of the data attribute in HTML?
The data attribute allows for the storage of additional data that is specific to an element and can be accessed using JavaScript or CSS.
13) What is the box sizing property in CSS?
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The box sizing property allows for the measurement of an element to include its padding and border, instead of just its content. It is useful for creating consistent sizes across different browsers.
14) How do you select all elements with a specific class in CSS?
To select all elements with a specific class, use the “.” followed by the class name as the CSS selector. For example, “.container” will select all elements with the class “container”.
15) How do you handle cross browser compatibility issues in web development?
Cross browser compatibility issues can be handled by using CSS resets, checking for compatibility using online tools, using browser specific CSS hacks, and testing the website on different browsers and devices before deployment.
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