What exactly do I have to escape inside a `script` element?

Question

What parts of JavaScript code do I have to escape inside a script element in a HTML page? Is <>& enough or too much?

[EDI

Answer 1

Generally, the only thing I escape is the / in closing tags. Thus:

var msg = "
Do you really<\/em> think so, Miss Worthington?<\/p>";

For the rest, I rely on commenting out the entire thing:

The comment takes care of the HTML opening tags.