Mi sono collegata al sito http://validator.w3.org/ per sottoporre la mia home page:
www.liceomarconicolleferro.it
Tutta la pagina è giusta tranne 8 errori, trovati tutti nel codice shynistat, che ho a suo tempo introdotto con il solito metodo del "copia-incolla": riporto qui di seguito la segnalazione (anch'essa copiata e incollata!).
Grazie, danchesce, mersì, tenchiù!

Below are the results of attempting to parse this document with an SGML parser.

Line 168, column 8: there is no attribute "HREF"

<A HREF="http://www.shinystat.it/cgi-bin/shinystatv.cgi?USER=LICEOMARCONICOLLEFE

You have used the attribute named above in your document, but the document type you are using does not support that attribute for this element. This error is often caused by incorrect use of the "Strict" document type with a document that uses frames (e.g. you must use the "Transitional" document type to get the "target" attribute), or by using vendor proprietary extensions such as "marginheight" (this is usually fixed by using CSS to achieve the desired effect instead).

This error may also result if the element itself is not supported in the document type you are using, as an undefined element will have no supported attributes; in this case, see the element-undefined error message for further information.

How to fix: check the spelling and case of the element and attribute, (Remember XHTML is all lower-case) and/or check that they are both allowed in the chosen document type, and/or use CSS instead of this attribute.

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Line 168, column 92: there is no attribute "target"

...?USER=LICEOMARCONICOLLEFERRO" target="_top">

✉

Line 168, column 98: element "A" undefined

...LICEOMARCONICOLLEFERRO" target="_top">

You have used the element named above in your document, but the document type you are using does not define an element of that name. This error is often caused by incorrect use of the "Strict" document type with a document that uses frames (e.g. you must use the "Frameset" document type to get the "<frameset>" element), or by using vendor proprietary extensions such as "<spacer>" or "<marquee>" (this is usually fixed by using CSS to achieve the desired effect instead).

✉

Line 169, column 9: there is no attribute "SRC"

<IMG SRC="http://www.shinystat.it/cgi-bin/shinystat.cgi?USER=LICEOMARCONICOLLEFE

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Line 169, column 101: there is no attribute "BORDER"

...EOMARCONICOLLEFERRO&amp;NC=1" BORDER="0"></A>

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Line 169, column 104: element "IMG" undefined

...ARCONICOLLEFERRO&amp;NC=1" BORDER="0"></A>

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Line 169, column 108: end tag for "IMG" omitted, but OMITTAG NO was specified

...NICOLLEFERRO&amp;NC=1" BORDER="0"></A>

You may have neglected to close a tag, or perhaps you meant to "self-close" a tag; that is, ending it with "/>" instead of ">".

✉

Line 169, column 0: start tag was here

<IMG SRC="http://www.shinystat.it/cgi-bin/shinystat.cgi?USER=LICEOMARCONICOLLEFE