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1. What is the use of CORS?
CORS stands for Cross-origin Resource Sharing. It is a tool that enables the simultaneous request of multiple resources from a domain other than the current request domain.
2. What are the newly introduced input types in HTML5?
HTML5 has been redesigned numerous times over the last few years, and the addition of input types has made it a breeze to work with. Several of these input types include the following:
- color
- date
- Datetime-local
- next month
- number range
3. What is the use of a namespace in web development?
A namespace is a straightforward global object that contains methods, properties, and other objects. It improves usability through modularity, allowing users to reuse code and avoid naming conflicts.
4. What is SVG and why is it used?
SVG stands for Scalable Vector Graphics. It is used on the web to exhibit vector-based graphics. It is capable of rendering graphical content in XML format. SVG’s graphical content is of exceptional quality, allowing the user to provide high-quality images.
5. How can page loading time be reduced?
Numerous factors contribute to a website’s page load time. However, certain techniques can be employed to significantly reduce it. They are as follows:
- Reduction in the image size
- Removal of unnecessary widgets
- HTTP compression
- Reduction in lookups
- Minimal redirection and caching
6. What are some of the new features that were introduced in CSS3?
CSS3 introduced numerous changes that improved the framework’s overall usability and power. Several features were added and are now widely used, including the following:
- Rounded corners
- Animation
- Custom layout
- Media queries
7. What is the use of a selector in CSS?
Inline elements that require styling are styled using a CSS selector and a rule. Selectors make it simple to locate and select HTML elements based on their name, ID, or attribute value.
8. What is the use of Webkit in CSS3?
Webkit is an important software component in CSS that allows for the easy rendering of HTML and CSS elements in a variety of browsers, such as Chrome, Firefox, and Safari.
There are many engines for browsers, such as:
- Gecko for Mozilla
- Presto for Opera
- The Edge for Internet Explorer
9. What are the components of the CSS box model?
The CSS box model is used to identify an entity that contains all HTML content within a box or button element.
Four components are included:
- Border: This indicates the padding and content located on either side of the border.
- Content simply refers to the information that will be displayed.
- Margin: This term refers to the box element’s top layer.
- Padding describes the amount of empty space around an element.
10. What is the use of media queries in CSS3?
In CSS, media queries are often used to characterize styles that are responsive to the shape and size of the viewing window.
They are used to making the following adjustments to the following entities:
- Height
- Width
- Viewport
- Resolution
- Orientation
11. Why are external style sheets preferred?
External style sheets provide an ample number of advantages to developers. Some of the benefits are as follows:
- Classes can be reused any number of times.
- They allow for the style control of multiple documents through a single file.
- Selectors and groups can be used to easily apply styles.
12. What are the various data types present in JavaScript?
JavaScript supports the following data types:
- Boolean
- Number
- Object
- Undefined
- Null
- String
- Function
13. What is the difference between cookies and local storage?
Cookies
- Both the client and the server have access to cookie data.
- Cookies have an expiration date, and data is deleted after the expiration date.
Local Storage
- Data is only stored on the client-side machine’s local browser.
- Local storage does not have an expiration date unless the data is manually deleted.
14. What are some of the web development technologies that you know?
This is a frequently asked question during a web development interview. The answer is contingent upon your education, experience, and expertise in this field. A good web developer, on the other hand, will have an extensive working knowledge of any of the following technologies:
- HTML
- CSS
- JavaScript
- SQL
- Python
- PHP
15. What is the use of pseudo-classes in CSS?
Pseudo-classes are a widely used technique in CSS for changing the style of an element when its state changes.
There are numerous instances where you might want to use a pseudo-class:
- For the style change when the mouse moves over the element,
- For out-of-focus animations
- For providing styles for external links
16. What is the meaning of “long polling” in web development?
Long polling is a development pattern that is used to simulate a server-to-client data push operation.
When long polling is enabled, the client sends a request to the server, which then pushes the data. The connection will time out only when the client receives the data or when the timeout criteria are met.
17. What are the five elements that support media content in HTML5?
There are five main elements in HTML5 that support media:
- audio >
- video >
- source >
- embed >
- track >
18. What are some of the new features that were introduced in CSS3?
CSS3 has brought about a lot of changes, making the overall framework more user-friendly and powerful.
Some of the features that were added and are very popularly used now are:
- Rounded corners
- Animation
- Custom layout
- Media queries
19. What are some of the properties of transitions in CSS3?
Transitions in CSS3 are easy to use, and they provide users with rapid and efficient animation effects.
The four main properties present in the transitions are:
- transition-delay
- transition-duration
- transitional property
- transitional timing function
20. What is Responsive Web Design (RWD) in HTML and CSS?
Responsive Web Design is a concept that enables web pages to scale across multiple resolutions without sacrificing content or causing screen tearing.
It automatically adjusts the web page’s structure based on the device being used to view it, ensuring an optimal viewing experience.
21. What is the use of canvas in HTML?
Canvas was added to HTML5 to give users the ability to draw graphics on the go using JavaScript. There are a variety of methods in “canvas” to allow for the drawing of paths, circles, boxes, images, and more.
22. What is the difference between XHTML and HTML?
XHTML
Tags should be in lowercase
Tags should be closed once opened.
Attributes must be enclosed in double-quotes.
HTML
It is not case-sensitive.
Open-ended tags can be used.
Attributes can be used without quotation marks.
