Note: The Validator XML support has some limitations.
This page is not Valid XHTML 1.0 Strict!
Below are the results of checking this document for XML well-formedness and validity.
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Error
Line 85 column 2:
"DOCTYPE" declaration not allowed in instance.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN" "http://www.w3.org/TR -
Error
Line 86 column 15:
document type does not allow element "html" here.
<html dir="ltr">The element named above was found in a context where it is not allowed. This could mean that you have incorrectly nested elements -- such as a "style" element in the "body" section instead of inside "head" -- or two elements that overlap (which is not allowed).
One common cause for this error is the use of XHTML syntax in HTML documents. Due to HTML's rules of implicitly closed elements, this error can create cascading effects. For instance, using XHTML's "self-closing" tags for "meta" and "link" in the "head" section of a HTML document may cause the parser to infer the end of the "head" section and the beginning of the "body" section (where "link" and "meta" are not allowed; hence the reported error).
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Error
Line 88 column 15:
there is no attribute "rows".
<frameset rows="100%"><frame src="http://elearn.metrotech.org/file.php/527/calc.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. If you received this error when using the <embed> element to incorporate flash media in a Web page, see the FAQ item on valid flash.
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Error
Line 88 column 21:
element "frameset" undefined.
<frameset rows="100%"><frame src="http://elearn.metrotech.org/file.php/527/calc.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),
- by using vendor proprietary extensions such as "<spacer>" or "<marquee>" (this is usually fixed by using CSS to achieve the desired effect instead).
- by using upper-case tags in XHTML (in XHTML attributes and elements must be all lower-case.
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Error
Line 88 column 33:
there is no attribute "src".
<frameset rows="100%"><frame src="http://elearn.metrotech.org/file.php/527/calc. -
Error
Line 88 column 87:
element "frame" undefined.
...trotech.org/file.php/527/calc.html" /></frameset></html> -
Error
Line 88 column 105:
end tag for "html" which is not finished.
...hp/527/calc.html" /></frameset></html>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, <head> generally requires a <title>, lists (ul, ol, dl) require list items (li, or dt, dd), and so on.
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Error
Line 88 column 106:
end tag for "div" omitted, but OMITTAG NO was specified.
...p/527/calc.html" /></frameset></html>You may have neglected to close an element, or perhaps you meant to "self-close" an element, that is, ending it with "/>" instead of ">".
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Info
Line 84 column 4:
start tag was here.
<div id="content"> -
Error
Line 88 column 106:
end tag for "div" omitted, but OMITTAG NO was specified.
...p/527/calc.html" /></frameset></html> -
Info
Line 81 column 0:
start tag was here.
<div id="page"> -
Error
Line 88 column 106:
end tag for "body" omitted, but OMITTAG NO was specified.
...p/527/calc.html" /></frameset></html> -
Info
Line 79 column 0:
start tag was here.
<body class="mod-lesson course-1 nocoursepage editing" id="mod-lesson-mediafil. -
Error
Line 88 column 106:
end tag for "html" omitted, but OMITTAG NO was specified.
...p/527/calc.html" /></frameset></html> -
Info
Line 2 column 0:
start tag was here.
<html xmlns="http://www.w3.org/1999/xhtml" dir="ltr" lang="en-us" xml:lang="en-u