Errors found while checking this document as HTML 4.01 Transitional!

Result: 3 Errors, 1 warning(s)
:
: iso-8859-1
: HTML 4.01 Transitional
Root Element: HTML
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Help on the options is available.

Notes and Potential Issues

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.

  1. Info No Character encoding declared at document level

    No character encoding information was found within the document, either in an HTML meta element or an XML declaration. It is often recommended to declare the character encoding in the document itself, especially if there is a chance that the document will be read from or saved to disk, CD, etc.

    See this tutorial on character encoding for techniques and explanations.

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Validation Output: 3 Errors

  1. Error Line 26, Column 159: document type does not allow element "A" here 
    ….de/mozilla-und-co/kleine-netscape-geschichte/">Netscape History (in German)<a>

    ✉

    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).

  2. Error Line 27, Column 5: end tag for "A" omitted, but its declaration does not permit this 
    </ul>

    ✉

    • You forgot to close a tag, or
    • you used something inside this tag that was not allowed, and the validator is complaining that the tag should be closed before such content can be allowed.

    The next message, "start tag was here" points to the particular instance of the tag in question); the positional indicator points to where the validator expected you to close the tag.

  3. Info Line 26, Column 157: start tag was here 
    ….de/mozilla-und-co/kleine-netscape-geschichte/">Netscape History (in German)<a>
  4. Error Line 27, Column 5: end tag for "A" omitted, but its declaration does not permit this 
    </ul>

    ✉

    • You forgot to close a tag, or
    • you used something inside this tag that was not allowed, and the validator is complaining that the tag should be closed before such content can be allowed.

    The next message, "start tag was here" points to the particular instance of the tag in question); the positional indicator points to where the validator expected you to close the tag.

  5. Info Line 26, Column 5: start tag was here 
    <li><a href="https://web.archive.org/web/20170716070626/http://www.holgermetzge…

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