Errors:
Almost standards mode doctype. Expected “<!DOCTYPE html>”.
Start tag “head” seen but an element of the same type was already open.
Bad value “cache-control” for attribute “http-equiv” on element “meta”.
A document must not include more than one “meta” element with a “http-equiv” attribute whose value is “content-type”.
A document must not include both a “meta” element with an “http-equiv” attribute whose value is “content-type”, and a “meta” element with a “charset” attribute.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Bad value “” for attribute “src” on element “iframe”: Must be non-empty.
Bad value “99.6%” for attribute “width” on element “iframe”: Expected a digit but saw “.” instead.
Bad value “100%” for attribute “height” on element “iframe”: Expected a digit but saw “%” instead.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Bad value “450px” for attribute “height” on element “iframe”: Expected a digit but saw “p” instead.
Saw “<” when expecting an attribute name. Probable cause: Missing “>” immediately before.
A slash was not immediately followed by “>”.
End tag had attributes.
End tag “nav” seen, but there were open elements.
Unclosed element “div”.
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Bad value “941px” for attribute “width” on element “img”: Expected a digit but saw “p” instead.
Bad value “81px” for attribute “height” on element “img”: Expected a digit but saw “p” instead.
Bad value “89px” for attribute “width” on element “img”: Expected a digit but saw “p” instead.
Bad value “88px” for attribute “height” on element “img”: Expected a digit but saw “p” instead.
Bad value “164px” for attribute “width” on element “img”: Expected a digit but saw “p” instead.
Bad value “217px” for attribute “height” on element “img”: Expected a digit but saw “p” instead.
Bad value “/Images/Books/9789385891892-Volume 1.jpg” for attribute “src” on element “img”: Illegal character in path segment: space is not allowed.
Bad value “40px” for attribute “width” on element “img”: Expected a digit but saw “p” instead.
Bad value “104px” for attribute “height” on element “img”: Expected a digit but saw “p” instead.
Duplicate ID “bookpage1”.
Bad value “440px” for attribute “height” on element “iframe”: Expected a digit but saw “p” instead.
Element “ul” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Bad value “500px;” for attribute “height” on element “iframe”: Expected a digit but saw “p” instead.
The “center” element is obsolete. Use CSS instead.
Element “style” not allowed as child of element “noscript” in this context. (Suppressing further errors from this subtree.)
End tag for “body” seen, but there were unclosed elements.
Warnings:
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
Consider using the “h1” element as a top-level heading only (all “h1” elements are treated as top-level headings by many screen readers and other tools).
Empty heading.
The first occurrence of ID “bookpage1” was here.
The “language” attribute on the “script” element is obsolete. You can safely omit it.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
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