1) What is CSS?

CSS stands for Cascading Style Sheet. It is a popular styling language which is used with HTML to design websites. It can also be used with any XML documents including plain XML, SVG, and XUL.More details...

2) What is the origin of CSS?
SGML (Standard Generalized Markup Language) is the origin of CSS. It is a language that defines markup languages.

3) What are the different variations of CSS?
Following are the different variations of CSS:

• CSS1
• CSS2
• CSS2.1
• CSS3
• CSS4
   

4) How can you integrate CSS on a web page?
There are three methods to integrate CSS on web pages.

Inline method - It is used to insert style sheets in HTML document
Embedded/Internal method - It is used to add a unique style to a single document
Linked/Imported/External method - It is used when you want to make changes on multiple pages.
More details...

5) What are the advantages of CSS?
Bandwidth
Site-wide consistency
Page reformatting
Accessibility
Content separated from presentation
 

6) What are the limitations of CSS?
Ascending by selectors is not possible
Limitations of vertical control
No expressions
No column declaration
Pseudo-class not controlled by dynamic behavior
Rules, styles, targeting specific text not possible
 

7) What are the CSS frameworks?
CSS frameworks are the preplanned libraries which make easy and more standard compliant web page styling. The frequently used CSS frameworks are: -

• Bootstrap
• Foundation
• Semantic UI
• Gumby
• Ulkit
   

8) Why background and color are the separate properties if they should always be set together?
There are two reasons behind this:

It enhances the legibility of style sheets. The background property is a complex property in CSS, and if it is combined with color, the complexity will further increase.
Color is an inherited property while the background is not. So this can make confusion further.