Errors:
No space between attributes.
Quote “"” in attribute name. Probable cause: Matching quote missing somewhere earlier.
Bad value “lang=” for attribute “lang” on element “html”: The language subtag “lang=” is not a valid language subtag.
Attribute “en-gb""” not allowed on element “html” at this point.
Using the “meta” element to specify the document-wide default language is obsolete. Consider specifying the language on the root element instead.
Bad value “android-touch-icon” for attribute “rel” on element “link”: The string “android-touch-icon” is not a registered keyword.
Bad value “windows-touch-icon” for attribute “rel” on element “link”: The string “windows-touch-icon” is not a registered keyword.
Bad value “https://fonts.googleapis.com/css?family=Roboto+Slab:300,400,700|Roboto:300,400,500,700” for attribute “href” on element “link”: Illegal character in query: “|” is not allowed.
Element “head” is missing a required instance of child element “title”.
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 “ul” in this context. (Suppressing further errors from this subtree.)
Element “a” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Duplicate attribute “class”.
A “link” element must not appear as a descendant of a “body” element unless the “link” element has an “itemprop” attribute or has a “rel” attribute whose value contains “dns-prefetch”, “pingback”, “preconnect”, “prefetch”, “preload”, “prerender”, or “stylesheet”.
Attribute “name” not allowed on element “meta” at this point.
Element “meta” is missing one or more of the following attributes: “itemprop”, “property”.
Element “title” not allowed as child of element “header” in this context. (Suppressing further errors from this subtree.)
Element “p” not allowed as child of element “h1” in this context. (Suppressing further errors from this subtree.)
No “p” element in scope but a “p” end tag seen.
Element “xml” not allowed as child of element “a” in this context. (Suppressing further errors from this subtree.)
Duplicate ID “Shape”.
End tag “a” violates nesting rules.
Duplicate ID “Symbols”.
Duplicate ID “footer”.
Warnings:
Attribute “en-gb""” is not serializable as XML 1.0.
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).
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The first occurrence of ID “Shape” was here.
The first occurrence of ID “Symbols” was here.
The first occurrence of ID “footer” was here.
This document appears to be written in English but the “html” start tag has “lang="lang="”. Consider using “lang="en"” (or variant) instead.
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