Learn-js.org W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Attribute “fb:like:layout” not allowed on element “a” at this point.
Attribute “g:plusone:size” not allowed on element “a” at this point.
Element “h1” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Element “p” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Element “h2” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Element “h3” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Element “ul” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Element “div” not allowed as child of element “button” in this context. (Suppressing further errors from this subtree.)
Warnings:
Attribute “fb:like:layout” is not serializable as XML 1.0.
Attribute “g:plusone:size” is not serializable as XML 1.0.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
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