Markup Validation Service
Check the markup (HTML, XHTML, …) of Web documents
Markup Validation Service
Check the markup (HTML, XHTML, …) of Web documents
The following notes and warnings highlight missing or conflicting information which caused the validator to perform some guesswork prior to validation, or other things affecting the output below. If the guess or fallback is incorrect, it could make validation results entirely incoherent. It is highly recommended to check these potential issues, and, if necessary, fix them and re-validate the document.
Mismatch between Public and System identifiers in the DOCTYPE declaration
This document uses an inconsistent DOCTYPE declaration.
The Public Identifier
-//W3C//DTD HTML 4.0//EN declares the
HTML 4.0 Strict document type, but the associated System Identifier
http://www.w3.org/TR/REC-html40/strict.dtd does not match this document type.
The recommended System Identifier
for HTML 4.0 Strict is http://www.w3.org/TR/1998/REC-html40-19980424/strict.dtd.
The safest way to use a correct DOCTYPE declaration is to copy and paste one from the recommended list and avoid editing that part of your markup by hand.
Line 636,
Column 41:
character "@" not allowed in attribute specification list
Reply-To: DDK-l List Owner <owner-ddk-l@albany.net> Reply-To: DDK-l List Owner <owner-ddk-l@albany.net>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:
Line 751,
Column 1:
character data is not allowed here
or this handyYou have used character data somewhere it is not permitted to appear. Mistakes that can cause this error include:
Line 752,
Column 24:
document type does not allow element "A" here; missing one of "P", "H1", "H2", "H3", "H4", "H5", "H6", "PRE", "DIV", "ADDRESS" start-tag
<a href="feedback.html">feedback.html</a>The mentioned element is not allowed to appear in the context in which you've placed it; the other mentioned elements are the only ones that are both allowed there and can contain the element mentioned. This might mean that you need a containing element, or possibly that you've forgotten to close a previous element.
One possible cause for this message is that you have attempted to put a block-level element (such as "<p>" or "<table>") inside an inline element (such as "<a>", "<span>", or "<font>").
Line 753,
Column 1:
character data is not allowed here
.You have used character data somewhere it is not permitted to appear. Mistakes that can cause this error include:
Line 1080,
Column 5:
end tag for element "UL" which is not open
</ul>The Validator found an end tag for the above element, but that element is not currently open. This is often caused by a leftover end tag from an element that was removed during editing, or by an implicitly closed element (if you have an error related to an element being used where it is not allowed, this is almost certainly the case). In the latter case this error will disappear as soon as you fix the original problem.
If this error occurred in a script section of your document, you should probably read this FAQ entry.
Line 1606,
Column 5:
end tag for element "Q" which is not open
</q>The Validator found an end tag for the above element, but that element is not currently open. This is often caused by a leftover end tag from an element that was removed during editing, or by an implicitly closed element (if you have an error related to an element being used where it is not allowed, this is almost certainly the case). In the latter case this error will disappear as soon as you fix the original problem.
If this error occurred in a script section of your document, you should probably read this FAQ entry.
Line 1609,
Column 5:
end tag for element "Q" which is not open
</q>The Validator found an end tag for the above element, but that element is not currently open. This is often caused by a leftover end tag from an element that was removed during editing, or by an implicitly closed element (if you have an error related to an element being used where it is not allowed, this is almost certainly the case). In the latter case this error will disappear as soon as you fix the original problem.
If this error occurred in a script section of your document, you should probably read this FAQ entry.
Line 1861,
Column 53:
cannot generate system identifier for general entity "threshold"
…://slashdot.org/comments.pl?sid=24346&threshold=1&commentsort=0&mode=thread&pi…An entity reference was found in the document, but there is no reference by that name defined. Often this is caused by misspelling the reference name, unencoded ampersands, or by leaving off the trailing semicolon (;). The most common cause of this error is unencoded ampersands in URLs as described by the WDG in "Ampersands in URLs".
Entity references start with an ampersand (&) and end with a semicolon (;). If you want to use a literal ampersand in your document you must encode it as "&" (even inside URLs!). Be careful to end entity references with a semicolon or your entity reference may get interpreted in connection with the following text. Also keep in mind that named entity references are case-sensitive; &Aelig; and æ are different characters.
If this error appears in some markup generated by PHP's session handling code, this article has explanations and solutions to your problem.
Note that in most documents, errors related to entity references will trigger up to 5 separate messages from the Validator. Usually these will all disappear when the original problem is fixed.
Line 1861,
Column 53:
general entity "threshold" not defined and no default entity
…://slashdot.org/comments.pl?sid=24346&threshold=1&commentsort=0&mode=thread&pi…This is usually a cascading error caused by a an undefined entity reference or use of an unencoded ampersand (&) in an URL or body text. See the previous message for further details.
Line 1861,
Column 62:
reference to entity "threshold" for which no system identifier could be generated
…ot.org/comments.pl?sid=24346&threshold=1&commentsort=0&mode=thread&pid=2638081…This is usually a cascading error caused by a an undefined entity reference or use of an unencoded ampersand (&) in an URL or body text. See the previous message for further details.
Line 1861,
Column 52:
entity was defined here
…p://slashdot.org/comments.pl?sid=24346&threshold=1&commentsort=0&mode=thread&p……org/comments.pl?sid=24346&threshold=1&commentsort=0&mode=thread&pid=2638081#26…An entity reference was found in the document, but there is no reference by that name defined. Often this is caused by misspelling the reference name, unencoded ampersands, or by leaving off the trailing semicolon (;). The most common cause of this error is unencoded ampersands in URLs as described by the WDG in "Ampersands in URLs".
Entity references start with an ampersand (&) and end with a semicolon (;). If you want to use a literal ampersand in your document you must encode it as "&" (even inside URLs!). Be careful to end entity references with a semicolon or your entity reference may get interpreted in connection with the following text. Also keep in mind that named entity references are case-sensitive; &Aelig; and æ are different characters.
If this error appears in some markup generated by PHP's session handling code, this article has explanations and solutions to your problem.
Note that in most documents, errors related to entity references will trigger up to 5 separate messages from the Validator. Usually these will all disappear when the original problem is fixed.
Line 1861,
Column 65:
general entity "commentsort" not defined and no default entity
…org/comments.pl?sid=24346&threshold=1&commentsort=0&mode=thread&pid=2638081#26…This is usually a cascading error caused by a an undefined entity reference or use of an unencoded ampersand (&) in an URL or body text. See the previous message for further details.
Line 1861,
Column 76:
reference to entity "commentsort" for which no system identifier could be generated
…mments.pl?sid=24346&threshold=1&commentsort=0&mode=thread&pid=2638081#2638107">This is usually a cascading error caused by a an undefined entity reference or use of an unencoded ampersand (&) in an URL or body text. See the previous message for further details.
Line 1861,
Column 64:
entity was defined here
….org/comments.pl?sid=24346&threshold=1&commentsort=0&mode=thread&pid=2638081#2……mments.pl?sid=24346&threshold=1&commentsort=0&mode=thread&pid=2638081#2638107">An entity reference was found in the document, but there is no reference by that name defined. Often this is caused by misspelling the reference name, unencoded ampersands, or by leaving off the trailing semicolon (;). The most common cause of this error is unencoded ampersands in URLs as described by the WDG in "Ampersands in URLs".
Entity references start with an ampersand (&) and end with a semicolon (;). If you want to use a literal ampersand in your document you must encode it as "&" (even inside URLs!). Be careful to end entity references with a semicolon or your entity reference may get interpreted in connection with the following text. Also keep in mind that named entity references are case-sensitive; &Aelig; and æ are different characters.
If this error appears in some markup generated by PHP's session handling code, this article has explanations and solutions to your problem.
Note that in most documents, errors related to entity references will trigger up to 5 separate messages from the Validator. Usually these will all disappear when the original problem is fixed.
Line 1861,
Column 79:
general entity "mode" not defined and no default entity
…mments.pl?sid=24346&threshold=1&commentsort=0&mode=thread&pid=2638081#2638107">This is usually a cascading error caused by a an undefined entity reference or use of an unencoded ampersand (&) in an URL or body text. See the previous message for further details.
Line 1861,
Column 83:
reference to entity "mode" for which no system identifier could be generated
…mments.pl?sid=24346&threshold=1&commentsort=0&mode=thread&pid=2638081#2638107">This is usually a cascading error caused by a an undefined entity reference or use of an unencoded ampersand (&) in an URL or body text. See the previous message for further details.
Line 1861,
Column 78:
entity was defined here
…mments.pl?sid=24346&threshold=1&commentsort=0&mode=thread&pid=2638081#2638107">…mments.pl?sid=24346&threshold=1&commentsort=0&mode=thread&pid=2638081#2638107">An entity reference was found in the document, but there is no reference by that name defined. Often this is caused by misspelling the reference name, unencoded ampersands, or by leaving off the trailing semicolon (;). The most common cause of this error is unencoded ampersands in URLs as described by the WDG in "Ampersands in URLs".
Entity references start with an ampersand (&) and end with a semicolon (;). If you want to use a literal ampersand in your document you must encode it as "&" (even inside URLs!). Be careful to end entity references with a semicolon or your entity reference may get interpreted in connection with the following text. Also keep in mind that named entity references are case-sensitive; &Aelig; and æ are different characters.
If this error appears in some markup generated by PHP's session handling code, this article has explanations and solutions to your problem.
Note that in most documents, errors related to entity references will trigger up to 5 separate messages from the Validator. Usually these will all disappear when the original problem is fixed.
Line 1861,
Column 91:
general entity "pid" not defined and no default entity
…mments.pl?sid=24346&threshold=1&commentsort=0&mode=thread&pid=2638081#2638107">This is usually a cascading error caused by a an undefined entity reference or use of an unencoded ampersand (&) in an URL or body text. See the previous message for further details.
Line 1861,
Column 94:
reference to entity "pid" for which no system identifier could be generated
…mments.pl?sid=24346&threshold=1&commentsort=0&mode=thread&pid=2638081#2638107">This is usually a cascading error caused by a an undefined entity reference or use of an unencoded ampersand (&) in an URL or body text. See the previous message for further details.
Line 1861,
Column 90:
entity was defined here
…mments.pl?sid=24346&threshold=1&commentsort=0&mode=thread&pid=2638081#2638107">…ot.org/comments.pl?sid=24346&threshold=1&commentsort=0&mode=thread&pid=2638081…This is usually a cascading error caused by a an undefined entity reference or use of an unencoded ampersand (&) in an URL or body text. See the previous message for further details.
Line 1861,
Column 52:
entity was defined here
…p://slashdot.org/comments.pl?sid=24346&threshold=1&commentsort=0&mode=thread&p……comments.pl?sid=24346&threshold=1&commentsort=0&mode=thread&pid=2638081#2638107This is usually a cascading error caused by a an undefined entity reference or use of an unencoded ampersand (&) in an URL or body text. See the previous message for further details.
Line 1861,
Column 64:
entity was defined here
….org/comments.pl?sid=24346&threshold=1&commentsort=0&mode=thread&pid=2638081#2……comments.pl?sid=24346&threshold=1&commentsort=0&mode=thread&pid=2638081#2638107This is usually a cascading error caused by a an undefined entity reference or use of an unencoded ampersand (&) in an URL or body text. See the previous message for further details.
Line 1861,
Column 78:
entity was defined here
…mments.pl?sid=24346&threshold=1&commentsort=0&mode=thread&pid=2638081#2638107">…comments.pl?sid=24346&threshold=1&commentsort=0&mode=thread&pid=2638081#2638107This is usually a cascading error caused by a an undefined entity reference or use of an unencoded ampersand (&) in an URL or body text. See the previous message for further details.
Line 1861,
Column 90:
entity was defined here
…mments.pl?sid=24346&threshold=1&commentsort=0&mode=thread&pid=2638081#2638107">No one should be allowed to design hardware without a software bitYou have used character data somewhere it is not permitted to appear. Mistakes that can cause this error include:
Line 1898,
Column 4:
document type does not allow element "BR" here; missing one of "P", "H1", "H2", "H3", "H4", "H5", "H6", "PRE", "DIV", "ADDRESS" start-tag
<br>The mentioned element is not allowed to appear in the context in which you've placed it; the other mentioned elements are the only ones that are both allowed there and can contain the element mentioned. This might mean that you need a containing element, or possibly that you've forgotten to close a previous element.
One possible cause for this message is that you have attempted to put a block-level element (such as "<p>" or "<table>") inside an inline element (such as "<a>", "<span>", or "<font>").
Line 1901,
Column 13:
end tag for "BLOCKQUOTE" which is not finished
</blockquote>Most likely, you nested tags and closed them in the wrong order. For example <p><em>...</p> is not acceptable, as <em> must be closed before <p>. Acceptable nesting is: <p><em>...</em></p>
Another possibility is that you used an element which requires a child element that you did not include. Hence the parent element is "not finished", not complete. For instance, in HTML the <head> element must contain a <title> child element, lists require appropriate list items (<ul> and <ol> require <li>; <dl> requires <dt> and <dd>), and so on.
Line 1970,
Column 1:
character data is not allowed here
Here are a few of my interests that my other web pagesYou have used character data somewhere it is not permitted to appear. Mistakes that can cause this error include:
Line 2139,
Column 15:
non SGML character number 146
"The Elephants MemoryYou have used an illegal character in your text. HTML uses the standard UNICODE Consortium character repertoire, and it leaves undefined (among others) 65 character codes (0 to 31 inclusive and 127 to 159 inclusive) that are sometimes used for typographical quote marks and similar in proprietary character sets. The validator has found one of these undefined characters in your document. The character may appear on your browser as a curly quote, or a trademark symbol, or some other fancy glyph; on a different computer, however, it will likely appear as a completely different character, or nothing at all.
Your best bet is to replace the character with the nearest equivalent ASCII character, or to use an appropriate character entity. For more information on Character Encoding on the web, see Alan Flavell's excellent HTML Character Set Issues reference.
This error can also be triggered by formatting characters embedded in documents by some word processors. If you use a word processor to edit your HTML documents, be sure to use the "Save as ASCII" or similar command to save the document without formatting information.
