Errors found while checking this document as XHTML 1.0 Strict!

Result: 3 Errors
:
: iso-8859-1
: XHTML 1.0 Strict
Root Element: html
Root Namespace: http://www.w3.org/1999/xhtml
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Validation Output: 3 Errors

  1. Error Line 124, Column 48: an attribute value must be a literal unless it contains only name characters 
    …   <a href="download.php"><abbr title=\"Portable Document Format\">PDF</abbr><…

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    You have used a character that is not considered a "name character" in an attribute value. Which characters are considered "name characters" varies between the different document types, but a good rule of thumb is that unless the value contains only lower or upper case letters in the range a-z you must put quotation marks around the value. In fact, unless you have extreme file size requirements it is a very very good idea to always put quote marks around your attribute values. It is never wrong to do so, and very often it is absolutely necessary.

  2. Error Line 124, Column 68: "Document" is not a member of a group specified for any attribute 
    … <a href="download.php"><abbr title=\"Portable Document Format\">PDF</abbr></a>

    ✉

  3. Error Line 124, Column 74: "Format" is not a member of a group specified for any attribute 
    … <a href="download.php"><abbr title=\"Portable Document Format\">PDF</abbr></a>

    ✉

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