Below are the results of attempting to parse this document with an SGML parser.
1.
Line 1, column 0: no document type declaration; implying "<!DOCTYPE HTML SYSTEM>"
<html>
The checked page did not contain a document type ("DOCTYPE") declaration. The Validator has tried to validate with the HTML 4.01 Transitional DTD, but this is quite likely to be incorrect and will generate a large number of incorrect error messages. It is highly recommended that you insert the proper DOCTYPE declaration in your document -- instructions for doing this are given above -- and it is necessary to have this declaration before the page can be declared to be valid.
2.
Line 5, column 29: required attribute "TYPE" not specified
<script language="JavaScript">
The attribute given above is required for an element that you've used, but you have omitted it. For instance, in most HTML and XHTML document types the "type" attribute is required on the "script" element and the "alt" attribute is required for the "img" element.
Typical values for type are type="text/css" for <style> and type="text/javascript" for <script>.
3.
Line 15, column 74: there is no attribute "ONLOAD"
...jpg" width="339" height="364" onLoad="MM_openBrWindow('frameset.html','','wid
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.
4.
Line 15, column 134: required attribute "ALT" not specified
...set.html','','width=750,height=530')">
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Topic: sito web che presenta differenze tra IE e Firefox (Letto 5809 volte)