CSS3 Basic Interview Questions and Answers for Web Designers and Developers

CSS3 Basic Interview Questions and Answers for Web Designers and Developers

Below is the list of CSS3 basic interview questions and answers. These CSS3 interview questions and answers are meant for freshers as well as for experienced web designers and developers. So, If you going for an interview on CSS3,  I suggest you to must give a look at following CSS3 interview questions. These CSS3 interview questions are based on basic introduction to CSS3, why we need CSS3, difference between CSS and CSS3, CSS3 modules, CSS3 browser support, rounded corners in CSS3, borders and shadows in CSS3, CSS3 animation and opacity etc. So lets have a look on following basic CSS3 interview questions and answers.

1. What is the difference between CSS and CSS3?

CSS3 is upgreaded version of CSS with new future like Selectors,Box Model, Backgrounds and Borders, Text Effects,2D/3D Transformations, Animations, Multiple Column Layout, User Interface etc
2. List out CSS3 modules.

Below are the listed major modules:

Box Model
Backgrounds and Borders
Text Effects
2D/3D Transformations
Multiple Column Layout
User Interface
3. What new futures added in CSS3 for Borders and how Browser Support it?

Following border futures added:


and all modern Browser Support it like below:

Internet Explorer 9 supports border-radius and box-shadow
Firefox requires the prefix -moz- for border-image.
Chrome and Safari requires the prefix -webkit- for border-image.
Opera requires the prefix -o- for border-image.
4. How you will create Rounded Corners using CSS3?

We have to creat a class like below:

border:2px solid #ff0000;
-moz-border-radius:25px; /* Firefox */
-webkit-border-radius:25px; /* Chrome and Safari */
-o-border-radius:25px; /* Opera */

and we have to add this class where we want the round corner like in below div
<div class="roundc" > this is the round corner by css3 </div>
5. How we create border using images by CSS3?

By using border-image: property of css3 we can create a border using images like below

border-image:url(borderpcds.png) 30 30 round;
-moz-border-image:url(borderpcds.png) 30 30 round; /* Firefox */
-webkit-border-image:url(borderpcds.png) 30 30 round; /* Safari and Chrome */
-o-border-image:url(borderpcds.png) 30 30 round; /* Opera */

-moz-border-image:url(borderpcds.png) 30 30 stretch; /* Firefox */
-webkit-border-image:url(borderpcds.png) 30 30 stretch; /* Safari and Chrome */
-o-border-image:url(borderpcds.png) 30 30 stretch; /* Opera */
border-image:url(borderpcds.png) 30 30 stretch;
6. How you will create Box Shadow and text Shadow using CSS3?

Like below we can create Box Shadow using CSS3 .boxshadowabc
box-shadow: 10px 10px 5px #ccccc;

text-shadow: 5px 5px 5px #FF0000;

and then need to use these class boxshadownabc ,textshadowabc
7. What is the CSS3 The background size Property?

The background-size property specifies the size of the background image.

As we know Before CSS3, the background image size was find out by the real size of the image. In CSS3 it is possible to specify the size of the background image, which allows you to re-use background images in different ways.

-moz-background-size:80px 60px; /* Firefox 3.6 */
background-size:80px 60px; /* or we can do background-size:100% 100%;*/
8. What is the word wrap / word wrapping in CSS3?

To Allow long words to be able to break and wrap onto the next line in css3 we used word-wrap property like below class 

9. What is the CSS3 animation?

When the animation is created in the @keyframe, bind it to a selector, otherwise the animation will have no effect.

Bind the animation to a selector by specifying at least these two CSS3 animation properties:

A) Specify the name of the animation
B) Specify the duration of the animation   

10. What is Opacity in CSS3?

Opacity is used to show or hide the html element For example 0 for hide and 1 for show.

11. What is the other name of combined selector in CSS3 and what is it used for?

The other name of combined selector in CSS3 is known as Grouping

12. How is multiple background images handled in CSS3?

If you want to use the multiple background ,we can insert as follows...

background-image: url(decoration.png), url(ribbon.png), url(old_paper.jpg); also we can mention the position of the image either percentage value or top left, left center like this

13. What is wrapping in CSS3?

Wrapping is a vital property for proper display of contents in web pages. If wrapping is disabled then the user could not display and view long lines that goes outside the window boundary and thus becomes useless.


The wrap() method wraps specified HTML element(s) around each selected element.



where wrapping element specifies what HTML element(s) to wrap around each selected element.It's compulsory.

Possible values:

HTML elements
jQuery objects 
DOM elements

function(index) is Optional. Specifies a function that returns the wrapping element 

index - Returns the index position of the element in the set

14. What is the syntax of opacity in CSS3?

Firefox uses the property opacity:x

IE uses filter:alpha (opacity=x)

15. What is CSS rule 'ruleset'? 

There are two types of CSS rules: ruleset and at-rule.

Ruleset identifies selector or selectors and declares style which is to be attached to that selector or selectors. For example P {text-indent: 10pt} is a CSS rule. CSS rulesets consist of two parts: selector, e.g. P and declaration, e.g. {text-indent: 10pt}.

P {text-indent: 10pt} - CSS rule (ruleset)
{text-indent: 10pt} - CSS declaration
text-indent - CSS property
10pt - CSS value

16. What are the various style sheets?  

Inline, external, imported and embedded are the different types of style sheets.

17. What are style sheet properties?

CSS Background
CSS Text
CSS Font
CSS Border
CSS Outline
CSS Margin
CSS Padding
CSS List
CSS Table

18. List various font attributes used in style sheet?


19. What are the five possible values for “position”? 

Values for position: static, relative, absolute, fixed, inherit 

20. What does isNaN function do? 

Return true if the argument is not a number.       

21. What is a CSS File? It is used for what purpose?

CSS stands for "Cascading Style Sheets", and are used to control and manage font styles, font sizes, and web site color combinations that are used in a web page. In order to retain continuity of "look and feel" throughout a website, all pages within a website will often refer to a single CSS file. The CSS file is typically contained in a separate file from the website, and the various web pages retrieve the CSS file each time a web page is displayed. CSS files 
make global appearance changes easy -- a single change in a CSS file will mean that any pages using that CSS file will automatically display the changes .

22. How do I make a picture as a background on my web pages?

Point the body background to the name of your image you wish to use as the background as shown below. This body line should be the first line after your < / head> tag.

<body background="picture.gif">

You can also have the background image fixed, so it does not move when using the scroll bar in the browser. To do this add the BGPROPERTIES tag as shown below. 

<body background="picture.gif" bgproperties="fixed"> 

23. How do I add scrolling text to my page? 

Keep in mind not all browsers support scrolling text. however to do this add a tag similar to the below example:

<marquee >THIS WOULD SCROLL< /marquee> 

The above example would create the below scrolling text. If your browser supports scrolling text the below example should be scrolling. More examples can be found on our main HTML page that lists most of the HTML commands. 

24. How do I make it so that someone can mail me by just clicking on text with subject?

Use the mailto command in your A HREF link tag as shown below:

<a href="mailto:support@computerhope.com?Subject=Enquiry">Click here to mail</ a> . 

25. How do I align pictures so that one may be higher or lower than the other?

Use the align statement in your IMG SRC tag as shown below. 

<img src="http://www.computerhope.com/chguy.gif" align=top> 

Also, instead of align=top you can do align=middle, and align=bottom.  

26. What is external Style Sheet? How to link?

External Style Sheet is a template/document/file containing style information which can be linked with any number of HTML documents. This is a very convenient way of formatting the entire site as well as restyling it by editing just one file. The file is linked with HTML documents via the LINK element inside the HEAD element. Files containing style information must have extension .css, e.g. style.css. 

<LINK REL=STYLESHEET HREF="style.css" TYPE="text/css"> 
</ HEAD>   

27. Is CSS case sensitive? 

Cascading Style Sheets (CSS) is not case sensitive. However, font families, URLs to images, and other direct references with the style sheet may be. The trick is that if you write a document using an XML declaration and an XHTML doctype, then the CSS class names will be case sensitive for some browsers. It is a good idea to avoid naming classes where the only difference is the case, for example: div.myclass { ...} div.myClass { ... } If the DOCTYPE or XML declaration is ever removed from your pages, even by mistake, the last instance of the style will be used, regardless of case.   

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