HTML and CSS Reference
In-Depth Information
So far, you've seen the right way to put JavaScript in a
page, but you haven't done anything impressive (in fact,
you haven't done anything but pop up a message box).
Before going ahead, you need to know a bit more about
the role JavaScript typically plays.
First, it's important to understand that JavaScript code
is sandboxed , which means its capabilities are carefully
limited. Your page can't perform any potentially risky
tasks on your visitor's computer, like sending orders to
a printer, accessing files, running other programs, re-
formatting a hard drive, and so on. This design ensures
good security, even for careless visitors.
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