Which operator is used to test if a particular property exists or not? 

The function stops it execution when it encounters the 

Which event is generated when data changes in a control, such as a text field?

How do the client and server communicate using the WebSocket protocol?

Which method is used to append one HTML element to another HTML element?

What is the use of the * (asterisk) selector in jQuery?

When the 'end' event is fired on a stream to indicate that no more data will arrive, which function is called?

Which of the following statements about the Document Object Model (DOM) is true?

To open a dialog box each time an error occurs, which of the following is added to prefs.js?

What will be the output of the following JavaScript code?

<p id="demo"></p>
<script>
function myFunction()
{
  var patt = new RegExp("World", "g");
  var res = patt.toString();
  document.getElementById("demo").innerHTML = res;
}
</script>