We ll be talking about some fairly complicated Web page stuff like JavaScript , the text-based programming language that almost all web pages use if they have moving stuff on them. Newer web browsers have a built-in JavaScript interpreter that deciphers the JavaScript on web pages and turns it into activities. The little window that popped up is called a JavaScript Alert . You ve seen them on the Internet For Kids site if you visit the Wizard s Archives and close a window. The event-generating element in this case is called onMouseOver.
Browsers don t care.
That s perfectly cool to do. This tells the browser that moving a mouse pointer over something makes the event happen. Notice that, just like a regular attribute, the JavaScript is enclosed in quotation marks. Alert always calls up one of those message boxes. The message is enclosed in single quotes.