For var a = (1, 5 - 1) * 2 what is the value of a? 

Which of the following are JavaScript optimizers?

 Which identifier is used to represent a web browser window or frame? 

What is the output of the following code snippet?

x = 4 + "4";
document.write(x);

Which of the following constants has the value 255?

______() method is used to search a string with the specified pattern and return the found text as an object.

What is the output of the following JavaScript code?

var a = 10;

if(a == 20);

document.write(a);

 The expression of calling (or executing) a function or method in JavaScript is called ________ 

How will be the browsing histories be affected if the windows has child windows?

What are synthetic events in React?