Stack.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
Bad value “//fonts.googleapis.com/css?family=Source+Sans+Pro:400,600|Oswald:400|Roboto+Slab:700” for attribute “href” on element “link”: Illegal character in query: “|” is not allowed.
The “center” element is obsolete. Use CSS instead.
Bad value “” for attribute “height” on element “img”: The empty string is not a valid non-negative integer.
Bad value “” for attribute “width” on element “img”: The empty string is not a valid non-negative integer.
Attribute “alt” not allowed on element “a” at this point.
Saw “</>”. Probable causes: Unescaped “<” (escape as “<”) or mistyped end tag.
End tag “main” seen, but there were open elements.
Unclosed element “div”.
Bad value “” for attribute “action” on element “form”: Must be non-empty.
Element “img” is missing required attribute “src”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
The “itemprop” attribute was specified, but the element is not a property of any item.
Warnings:
The “banner” role is unnecessary for element “header”.
The “main” role is unnecessary for element “main”.
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