Top 250 Frontend Development Interview Questions and Answers

CSS3 is the latest version of Cascading Style Sheets used for styling web pages.

• CSS3 introduces new features like animations, transitions, and gradients.

• It also includes new selectors like :nth-child() and :not().

• CSS3 supports media queries for respo...read more

Virtual DOM is a lightweight representation of the actual DOM, optimizing updates and rendering in web applications.

• The Virtual DOM is a JavaScript object that mirrors the structure of the actual DOM.

• When changes occur, a new Virtual DOM is created a...read more

Responsive design using media queries and flexible layouts to adapt frontend to different devices.

• Use media queries in CSS to apply different styles based on screen size

• Utilize responsive frameworks like Bootstrap or Foundation for pre-built responsi...read more

Props are used to pass data from parent to child components, while events are used to communicate from child to parent components.

• Props are read-only and cannot be modified by the child component

• Events are emitted using $emit() method and can be list...read more

To handle drop-down, identify the element, select the option, and verify the selection.

• Identify the drop-down element using locators like ID, class, or XPath.

• Use Selenium's Select class to select the desired option.

• Verify the selection using assertio...read more

Create a page that moves

• Use CSS animations or transitions to create movement

• Consider using JavaScript for more complex animations

• Experiment with different types of movement such as sliding, fading, or rotating

DOM stands for Document Object Model, a programming interface for web documents.

• DOM is a tree-like structure that represents the HTML elements of a webpage.

• It allows developers to manipulate the content, structure, and style of a webpage using script...read more

Use jQuery to change the background color of all ul elements to blue.

• Use the jQuery selector to select all ul elements

• Use the css() method to change the background color to blue

Window load refers to the time it takes for a webpage to fully load all its content.

• It is a measure of the time it takes for a webpage to load completely

• It includes all the resources on the page such as images, scripts, and stylesheets

• A slow window l...read more

Achieve responsiveness in web page by using media queries, flexible layouts, and fluid images.

• Use CSS media queries to apply different styles based on screen size

• Create flexible layouts using CSS Grid or Flexbox

• Use relative units like percentages and...read more

A dynamic page can be created by using HTML, CSS, and JavaScript to add interactive elements and update content dynamically.

• Use HTML to structure the page and define the content.

• Apply CSS to style the page and make it visually appealing.

• Utilize JavaS...read more

Pure Components in React JS are components that do not re-render unless their props have changed.

• Pure Components extend React.Component and implement shouldComponentUpdate method for shallow comparison of props and state.

• Pure Components are more effi...read more

Large data on front end can be managed by implementing pagination, lazy loading, virtual scrolling, and data caching.

• Implement pagination to display data in smaller chunks, reducing load time and improving performance.

• Use lazy loading to only load da...read more

CSS3 is the latest version of Cascading Style Sheets used for styling web pages.

• CSS3 introduces new features like animations, transitions, and gradients.

• It also includes new selectors like :nth-child() and :not().

• CSS3 supports media queries for respo...read more

Minification is the process of removing unnecessary characters from code without affecting its functionality.

• Minification reduces file size by removing comments, whitespace, and renaming variables.

• It helps improve website loading speed and performanc...read more

Reflow is a process of melting and re-solidifying solder paste to create a permanent bond between components and PCB.

• Reflow is a critical step in surface mount technology (SMT) assembly.

• It involves heating the PCB and components to a specific tempera...read more

Responsive design using media queries and flexible layouts to adapt frontend to different devices.

• Use media queries in CSS to apply different styles based on screen size

• Utilize responsive frameworks like Bootstrap or Foundation for pre-built responsi...read more

To get the selected drop down list value, use the getSelectedValue() method.

• Use the getSelectedValue() method to get the selected value from the drop down list.

• Identify the drop down list element using its ID or name.

• Call the getSelectedValue() metho...read more

Props are used to pass data from parent to child components, while events are used to communicate from child to parent components.

• Props are read-only and cannot be modified by the child component

• Events are emitted using $emit() method and can be list...read more

The sequence of steps a browser takes to convert HTML, CSS, and JavaScript into a rendered page.

• Includes parsing HTML, constructing the DOM tree, calculating styles, and executing JavaScript.

• Optimizing the critical rendering path can improve page loa...read more

To handle drop-down, identify the element, select the option, and verify the selection.

• Identify the drop-down element using locators like ID, class, or XPath.

• Use Selenium's Select class to select the desired option.

• Verify the selection using assertio...read more

An accordion is a UI component that expands and collapses content sections when clicked.

• Use HTML, CSS, and JavaScript to create the accordion

• Each section should have a header and content that can be toggled

• Utilize event listeners to handle the click ...read more

To create a hyperlink in Razor, use the Html.ActionLink method.

• Use @Html.ActionLink() method in Razor to create a hyperlink

• Specify the link text, action method, controller name, and route values as parameters

• Example: @Html.ActionLink("Click here", "I...read more

Create a simple drop down menu using HTML and CSS

• Use element in HTML to create the drop down menuUse elements within the element to define the options in the menu

• Style the drop down menu using CSS to customize its appearance

Create a page that moves

• Use CSS animations or transitions to create movement

• Consider using JavaScript for more complex animations

• Experiment with different types of movement such as sliding, fading, or rotating

A clean and user-friendly navbar design for easy navigation on a website

• Include important links such as Home, About Us, Services, Contact

• Use clear and concise labels for each navigation item

• Consider using dropdown menus for subcategories

• Ensure the na...read more

DOM stands for Document Object Model, a programming interface for web documents.

• DOM is a tree-like structure that represents the HTML elements of a webpage.

• It allows developers to manipulate the content, structure, and style of a webpage using script...read more