We've seen that a web page is composed of elements — headings, paragraphs of text, images, buttons, and so on — and that you can listen for events that happen to these elements. For example, you could add a listener to a button, and it will run when the user clicks the button....three 'click' event listeners: one on the <button> , which shows...<div> that contains the <video> one on the <video> , which starts...