The Eye Movement Exercise is a great depiction of what is possible when HTML , CSS , and JavaScript come together. The exercise creates a webpage with two synchronized eyes that follow the user’s mouse movement. The Eye Movement exercise is a Mouse event that binds the DOM elements to certain events. Some of the events are as follows:

• click is triggered when the mouse is clicked.
• mousemove is triggered when the mouse moves over an element; triggering the mousemove element updates the position of the "eye" element displayed on the page.
• mouseleave is triggered when the mouse leaves the element; triggering the mouseleave element occurs by moving the mouse away from the element.