"Else IF" is not a condition in JavaScript

What is the code that could be used to count the number of characters in a value of a variable ?

"Else IF" could be used multiple times.

What is the code used to allow user input as a value to a variable in JavaScript?

An "ID" can be a word or a number.

Choose the codes that allow you to write into a <p> or a <h1>.

What is the "++" operator called ?

var x = 4

document.write(x **2)

What would be the value of x?

var x = 5;

var y = 2;

var z = x % y;

What would be the value of "z" in the above code?