XHTML won't validate && and < in a JavaScript function

Here's the snippet of code that won't validate:

if (user_age > 15 && user_age < 91)

It gets the following errors:

XML Parsing Error: StartTag: invalid element name


XML Parsing Error: xmlParseEntityRef: no name

The first error is thrown for the "less than" and the second one is thrown twice, once for each ampersand.

Replacing the above signs with & and < validates fine, but of course it completely ruins the function.


Or you can protect the script from the xml validation like this:

<script type="text/javascript"> 
    if (user_age > 15 && user_age < 91) {
        // do soemthing

Move script to other file :)

It is standard (and good) habit to separate style (into .css file), data (.html) and of course scripts to .js file.

All Javascript should be CDATA in XHTML:

if (user_age > 15 && user_age < 91)

put javascript in <![CDATA[...]]> section

you can try CDATA but some time it wont work, it depends on the setting of the server I guess. I am not a pro, but i tested, and I did not work, but if you put the javascript code in the .js file and then link this file somewhere in your body. it will definitely work. PERSONALLY TESTED.

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