Jamna questions

• @media queries : getting an error in W3C CSS Validation Service
• What is server side java script? Can we use java script also at server side? Which type of java script is necessary to know for a front-end developer?
• Responsive web design : "How to resize a background image according to browser window size using CSS"?
• What is "drawing context" exactly? What is the role of getcontext() method?
• Which way is best for creating an object in JavaScript? Is `var` necessary before an object property?

Jamna answers