Koala.net W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Element “script” must not have attribute “defer” unless attribute “src” is also specified.
Attribute “http-equiv” not allowed on element “meta” at this point.
Element “meta” is missing one or more of the following attributes: “itemprop”, “property”.
Element “style” not allowed as child of element “noscript” in this context. (Suppressing further errors from this subtree.)
Bad value “0/” for attribute “border” on element “img”: Only “0” is a permitted zero literal.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
The element “button” must not appear as a descendant of the “a” element.
Warnings:
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
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