HTML Validator

The errors and warnings are generated by a SGML Parser, the same parser used by the W3C validator. Language like HTML, SVG have DTD, definition file that describe the language syntax. When the parsed file does not respect the language, you have

HTML errors 
Warning:


HTML warnings
Good:


Or show the green icon, when there is no HTML errors.

Other icons

Charset:


The document contains characters that do not exist to the specified charset. The document can not be checked.
No data:


The HTML cache is empty. The validation can not be done.
inaktiv:


HTML Validator is deactivated.
Not in domain:


The URL is excluded by the Domain List defined in the options.

Extension homepage: http://users.skynet.be/mgueury/mozilla/