Introduction to CSS Interview Questions and Answers

CSS is referred to as a Cascading style sheet. It is a style sheet language used for presenting the HTML web pages. It is developed by Hakon Wium Lie and Bret Bos. It was initially marked in the year 1998. It helps in defining the font, color, and other properties. CSS pre-processors are used to write more effective CSS that splits it into multiple files and can be used a large number of functions along with variables like Sass. File splitting is used to decrease the page load time and making things easier to manage. There are areas where you won’t use all the styles, so separate style sheets and areas can be created. CSS pre-processor helps in achieving this and makes the performance better and secured. It is mainly used for medium to large projects.

Now, if you are looking for a job that is related to CSS then you need to prepare for the 2020 CSS Interview Questions. It is true that every interview is different as per the different job profiles. Here, we have prepared the important CSS Interview Questions and Answers which will help you get success in your interview.

In this 2020 CSS Interview Questions article, we shall present 10 most important and frequently used CSS interview questions. These questions will help students build their concepts around CSS and help them ace the interview.

Part 1 – CSS Interview Questions (Basic)

This first part covers basic Interview Questions and Answers

Q1. What are the advantages of CSS?

Answer:
The advantages of CSS are as below:

It helps in loading the pages faster as there is no need for writing HTML tag attributes every time. In CSS, it can be declared once and cab used many times.
It also helps in saving time as the same CSS style sheet can be used in other HTML pages as well.
It is easy to maintain if there is any change in style it can be done in one place and no need to do change in various places.
It helps in providing a better look at the HTML page as a comparison to HTML attributes or tags.
It helps in using the same HTML document in different devices and the different versions of a website.
It helps in doing offline browsing. It stores the application in the offline cache, which also helps in faster loading and better performance.
It is also platform-independent. It can be browsed in the latest browsers as well.

Q2. Explain the CSS components?

Answer:
This is the basic CSS Interview Questions that are asked in an interview It consists of three parts that are:

A selector is an HTML tag at which style will be applied. The tags are like <h1> etc.
Property is a type of HTML tag attributes, which are converted into CSS properties. Examples of this are the border, color, etc.
Values that are assigned to properties like defining any value of color or any other defined property in CSS.

Q3. Explain the different kinds of selectors and ways to target the elements?

Answer:
The different kinds of selectors are tags, id, and classes. The tag in CSS helps in referring to the HTML tag. The id helps in referring the HTML tag ID attribute and class helps in referring the class attribute on HTML tag.

The different ways to target elements are Tag, class, and ID. With the help of Tag, it can be targeted to the body, and class has been specified in HTML, it can be a target with ‘.classname’. The ID can be targeted with ‘#ID’,

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Q4. Explain the CSS box model and its elements?

Answer:
The CSS box model consists of the following items that are: Margin, Border, padding, and content. A margin is the topmost layer and in which the overall structure is described. A border is between margin and padding or it can be defined as the padding and content around with a border. The background color affects the border. Padding is space between border and content. It means if an element has the background color and that color will also fill in padding. Content is the actual data shown.

Q5. Explain the preferred way of font sizing?

Answer:
In CSS, defining the font size is very important for making the content as per the requirements. The size of the text mainly focused on the units that you have used. The units can be px, em, rem, %, vs, and vh. Mainly pixel (px) is used for defining the font sizes. As we know that all the browsers do not support the same fonts. Mainly web-safe fonts are installed in the systems and browsers sometimes not able to recognize. To avoid this fallback font is used to display the content in a browser.

Part 2 – CSS Interview Questions (Advanced)

Let us now have a look at the advanced Interview Questions.

Q6. Explain the term graceful degradation?

Answer:
In CSS, if any component will get fail, graceful degradation helps the component to work properly as required. While designing the webpage, the latest browser application is used. If an image is not able to view then its text can be shown.

Q7. What are the defined dimension properties?

Answer:
The defined dimension properties are Height, Min-height, Max-height, Width, Min-Width, and Max-Width.

Let us move to the next CSS Interview Questions.

Q8. Explain the various media types?

Answer:
The various media types used are screen, projection, aural, print, and handheld. CSS can be used for different screens like a computer or laptop screen. It can be used for a handheld device like a mobile. CSS is used to project on projectors. It is being used in sound synthesizer and speech. It also gives the preview of content while taking the print of the document.

Q9. Explain how to handle the browser differences in CSS?

Answer:
This is the advanced CSS Interview Questions asked in an interview. The latest browsers are updated with mostly all the features to handle the website or web applications. There is always a difference between the browsers as some of them support the CSS styles or some don’t support the same style. So there is always a limit of style that can be used with the usage of fallback styles. The feature @support in CSS helps in defining the certain feature available in the browser or not. If its available use that otherwise some alternative fallback style can be used.

Q10. Explain Flexbox and CSS grid?

Answer:
Flexbox is a layout tool that is very useful in smaller areas of the site. The main feature of this is to align items in a horizontal or vertical axis. It is used to space the item out automatically, with other layout options, and in a defined order to display the items.

CSS grid is almost a layout tool for the single page. It is used for layouts for both the horizontal and vertical axis unlike the flexbox tool, which is used only for one axis at a time.