You are developing an HTML5 web application. The application loads data from a web service by using AJAX. The application displays the data by calling the displayData function.

You are developing a web page that performs CPU-intensive calculations. A web worker processes these calculations on a separate background thread. The process is instantiated from the web page.

You are developing an HTML5 page named main.html. The JavaScript code for the main page is located in a file named myApp.js.

You are developing a JavaScript library.

You are developing an application that retrieves a stock rate from an external web service. A web page displays a simple rotating animation to indicate whether the stock rate is increased or decreased.

You are troubleshooting a web page that includes the following code segment.

You develop an HTML5 chat application.

You are creating a rotating image of a company logo.

You are developing an HTML5 web application that provides a discussion forum for users. When a user registers to access the application, the user enters an email address.

You have the following code. (Line numbers are included for reference only.)