What are some benefits of using jQuery?

You should be able to vocalize the benefits of jQuery. It is lightweight, open source, has lots of plugins, and jQuery has a great community and user support. It is incredibly good at matching CSS selectors, it supports chains of actions, and it has many useful AJAX methods. These are just some basic reasons. You [...]

Explain the benefits of CSS sprites?

Most importantly there is a performance benefit as CSS sprites reduce page load time by minimizing HTTP requests for different images. Usually there is also an accessibility benefit as the code degrades gracefully and shows text to screen readers, search engines, and browsers without CSS. I also think that CSS sprites are easier to manage [...]

Explain the difference between synchronous and asynchronous JS request?

Most importantly, synchronous request blocks JavaScript engine until the interaction with the server is complete. The user cannot click away, cancel request, or go to another tab during this time. It is bad for user experience and that is why we have AsynchronousJAX. (AJAX)

Explain briefly the difference between normal array and associative arrays?

This kind of a question could be rephrased as “explain the difference between a['one']=’dog’ and a[one]=’dog’” because the main difference between a normal array in JavaScript and associative arrays is that associative arrays use Strings instead of Integer numbers as index. But this is also kind of a trick question as JavaScript does not support [...]

What is the difference between undefined value and null value?

In JavaScript, undefined means that a value has been declared but has not yet been assigned a value, such as null, which can be assigned to a variable as a representation of no value. If a value is null, it was assigned programmatically, as JavaScript never sets a value to null on its own. Also, [...]

What is the main difference between window.onload and onDocumentReady?

Both functions are used to perform tasks when the page is loaded in the browser but they have important differences. Most importantly, “window.onload” will execute code when browser has loaded the DOM tree and all other resources like images, objects, etc, while onDocumentReady allows you to execute code when only the DOM tree has been [...]

Div Vs SPAN

DIV is used to select a block of text so that one can apply styles to it. SPAN is used to select inline text and let users to apply styles to it. The main difference between DIV and SPAN is SPAN does not do formatting by itself. Also the DIV tag is used as a [...]

What does it mean that Tim Berners-Lee invented the Web?

Tim Berners-Lee wrote a proposal in 1989 for a system called the World Wide Web. He then wrote the first Web browser, server, and Web page. He wrote the first specifications for URLs, HTTP, and HTML.

HTTP protocol?

HTTP stands for Hypertext Transfer Protocol and it is the foundation of data communication for the world wide web. HTTP functions as a request-response protocol in the client-server computing model. In HTTP, a web browser, for example, acts as a client, while an application running on a computer hosting a web site functions as a [...]

Graceful Degradation Vs. Progressive enhancement

Graceful degradation Providing an alternative version of your functionality or making the user aware of shortcomings of a product as a safety measure to ensure that the product is usable. Progressive enhancement Starting with a baseline of usable functionality, then increasing the richness of the user experience step by step by testing for support for [...]