Preserved Topic: "&&" as part of data (for XHTML)...

Greets!

I have a script that begins:
if ((!document.all) && (!document.getElementById)){

And the XHTML Transitional validator generates an error for each "&" saying:
Error: character "&" is the first character of a delimiter but occurred as data

I'm a little confused as to what that means. The script runs fine, and no other errors are reported by the validator. Can anyone shed some light on this?

In XHTML, even in script or style tags, ampersands (& mark the beginning of an entity, such as <, or ". So you have to either replace those with &&, or put the script in an outside file (recommended, since the first thing will confuse many older browsers). See http://www.w3.org/TR/xhtml1/ (sections 4.8 and C.4).

you should wrap stuff like that in CDATA brackets:

<![CDATA[   ...    ]]>