Amwa.org W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
No space between attributes.
“"” in an unquoted attribute value. Probable causes: Attributes running together or a URL query string in an unquoted attribute value.
Bad value “_new""” for attribute “target” on element “a”: Reserved keyword “new""” used.
Duplicate ID “header”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Element “div” not allowed as child of element “button” in this context. (Suppressing further errors from this subtree.)
Attribute “duration” not allowed on element “div” at this point.
Element “a” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
No “p” element in scope but a “p” end tag seen.
The “clear” attribute on the “br” element is obsolete. Use CSS instead.
Warnings:
The first occurrence of ID “header” was here.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
The “language” attribute on the “script” element is obsolete. You can safely omit it.
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