Copyright Goodheart-Willcox Co., Inc. Chapter 13 Internet and the World Wide Web 547 JavaScript JavaScript is an object-oriented programming language most often used in web development. When used as a browser enhancement, it allows web developers to create buttons, process forms, and vary the experience of the user based on selections made. The scripts are embedded in the HTML fi le itself. Because the rendering of the JavaScript to HTML is performed by the browser on the client’s (user’s) machine, it is called a client-side technology. A simple pop-up box is produced by the alert command in this JavaScript statement added to an HTML fi le: script alert(“A Pop-up!”) /script The result is shown in Figure 13-24. Notice the text between the quotation marks is the text displayed in the alert. When the alert is displayed, the browser halts loading the page until the user clicks the OK button. When the user clicks the OK button, the remainder of the page is loaded. Pop-up box Goodheart-Willcox Publisher Figure 13-24. This pop-up box is created with JavaScript.