Stutterheim.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “us” for attribute “lang” on element “html”: The language subtag “us” is not a valid ISO language part of a language tag.
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
Stray end tag “em”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Duplicate ID “newsletter-validate-detail”.
Duplicate ID “newsletter”.
Attribute “name” not allowed on element “meta” at this point.
Element “meta” is missing one or more of the following attributes: “itemprop”, “property”.
Attribute “name” not allowed on element “script” at this point.
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 “navigation” role is unnecessary for element “nav”.
The “contentinfo” role is unnecessary for element “footer”.
The first occurrence of ID “newsletter-validate-detail” was here.
The first occurrence of ID “newsletter” was here.
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).
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