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Old 08-18-2007, 06:31 AM   #1
CarlSeiler's Avatar
Join Date: Oct 2005
Location: Denton, TX
Posts: 280
Default Byte-Order Mark found in UTF-8 File.

I'm converting one of my pages from handwritten HTML 4.01 to php that generates XHTML 1.0 Strict. When I went to validate it at W3C, after cleaning up some closing slashes I'd missed on my img tags, I got a validation, but also got this warning message with a little yellow bang:
Byte-Order Mark found in UTF-8 File. 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.

I have no idea what that means, but indeed the file appears to have three little extra high-bit characters at the start. I don't have them in my php files, so I guess the server is adding them. In fact, I noticed that before I cleaned up my pages so it would validate correctly, Firefox would even display the characters. Now that it validates, Firefox doesn't display them, but I do get the warning message in the validator. Dillo 0.8 under Linux displays the characters.

How do I stop the BOM? Should I even worry about it?

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