Question

I created a simple test page on my website http://www.xaisoft.com and it had no errors, but it came back with the following warning and I am not sure what it means.

The Unicode Byte-Order Mark (BOM) in UTF-8 encoded files is known to cause problems for some text editors and older browsers. You may want to consider avoiding its use until it is better supported.

Answer 1

To find out what the BOM is, you can take a look at the Unicode FAQ (quoting) :

Q: What is a BOM?

A: A byte order mark (BOM) consists of
the character code U+FEFF at the
beginning of a data stream, where it
can be used as a signature defining
the byte order and encoding form,
primarily of unmarked plaintext files.
Under some higher level protocols, use
of a BOM may be mandatory (or
prohibited) in the Unicode data stream
defined in that protocol.

Depending on your editor, you might find an option in the preferences to indicate it should save unicode documents without a BOM… or change editor ^^