The iCab error report doesn't support XHTML yet. Therefore no errors can be reported.

In the tag <@> the attribute "~" should only contain absolute pixel values.

The character '>' should be written as '&gt;'. 

The value of <!DOCTYPE> is unknown.

<!DOCTYPE> is missing.

In the tag <@> the value of the attribute "~" is not valid.

In the tag <@> the value of the attribute "~" must be enclosed in quotes.

The tag <@> is an extension by Microsoft and not part of the HTML standard. 

The attribute "~" is not allowed for the tag <@>.

It is impossible to set the frame dimensions as they are defined.

The tag <@> is only part of "HTML 4.0 Frameset".

The tag <@> is an extension by Netscape and not part of the HTML standard. 

The tag <@> should no longer be used since HTML 4.0.

The color name "°" is not part of the HTML standard.