Looks crazy. When I first ran across it, I assumed it was a random comment left by a developer (meaningful only to him or her). But there’s actually a really good reason why you’ll want to use this code.

When you validate a page using the W3C Markup Validation Service, the < and > characters are important. As a document is parsed, the validator relies on these characters to let it know when it has reached a tag in your HTML code. The parser uses a page’s tag hierarchy to understand the structure of your page and to determine if anything is invalid.

So, when it stumbles upon a random < or > in embedded JavaScript, the parser will get angry and return an error. (Note: Inline, or embedded, JavaScript is any script that is included directly in your HTML. It’s always a better practice to use external JavaScript files, but in the cases where inline scripts are unavoidable, continue reading.) The parser thinks it is encountering the beginning or ending of a tag, when in actuality it may have found a logical greater or lesser symbol instead.

To prohibit the parser from encountering and evaluating code, like JavaScript, surround the code in the gibberish above. For example:

Now your JavaScript is untouchable and will not anger pesky validators. Check those errors off the list! (All of the other errors really are your fault, though. Lazy developer.)

Note: The comment characters /* and */ are not required, but failure to include them will cause some JavaScript compilers to freak out. Be safe, include them.

Googling for a standards-compliant alternative results in far too many options. Here’s the easiest and cleanest solution I’ve found:

Extremely compact and efficient.

While we’re on the topic, don’t validate this blog. It has 32 errors and 11 warnings, according to the W3C. No, this isn’t one of those “do as I say, not as I do” copouts. I plan to try and eliminate all errors and will even write a post about the process since, IMHO, validating your site is one of the most important things you should do before launching it.