Online-sciences.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Attribute “xmlns:fb” not allowed here.
Attribute “xmlns:addthis” not allowed here.
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Element “div” is missing one or more of the following attributes: “role”.
Duplicate ID “post-43550”.
Duplicate ID “post-44170”.
Duplicate ID “post-44072”.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The “allowtransparency” attribute on the “iframe” element is obsolete. Use CSS instead.
Duplicate ID “mNCC”.
Warnings:
Attribute with the local name “xmlns:fb” is not serializable as XML 1.0.
Attribute with the local name “xmlns:addthis” is not serializable as XML 1.0.
The first occurrence of ID “post-43550” was here.
The first occurrence of ID “post-44170” was here.
The first occurrence of ID “post-44072” was here.
Empty heading.
The “language” attribute on the “script” element is obsolete. You can safely omit it.
The first occurrence of ID “mNCC” was here.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
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