The Closure Compiler was introduced by ___________

Which event occurs when the user clicks on an HTML element?

Which of the following object defines an API for determining the user's geographical location?

When is the mouseout event fired?

 What will happen if a return statement does not have an associated expression? 

Which Angular form validators allow you to validate form information against your backend using $http?

What does the following JavaScript code do?

data.sort(function(a, b) { return b - a; });

How does the Closure Compiler improve the efficiency of JavaScript files?

The changeYear property of the datepicker widget is used to display the dropdown list so the user can select the year.

Create a class that calculates the area of a rectangle.