Introduction
Welcome to JavaScript: A Beginner’s Guide, Fourth Edition! Years ago, I was surfing the Web and noticed that people were publishing pages about themselves and calling them homepages. After viewing a number of these, I decided to create a homepage myself. I had no idea where to begin but, through trial and error, I figured out how to code HTML and publish my documents on a Web server. Over time, I saw some interesting effects used on other homepages (like alert messages that popped up out of nowhere or images that would magically change when I moved my mouse over them). I was curious and just had to know what was being done to create those effects. Were these page creators using HTML tags I did not know about?
Eventually, one site ...
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