Billyjoel.com W3C HTML Markup Validation
HTML markup errors and warnings
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Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
Element name “fb:like” cannot be represented as XML 1.0.
The first occurrence of ID “primary-menu” was here.
Errors:
Element “title” not allowed as child of element “head” in this context. (Suppressing further errors from this subtree.)
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Element “fb:like” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Duplicate ID “primary-menu”.
An element with “role=tab” must be contained in, or owned by, an element with “role=tablist”.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The “sizes” attribute may be specified only if the “srcset” attribute is also present.
Character reference was not terminated by a semicolon.
Character reference expands to a control character (U+0008).
No digits after “”.
Text not allowed in element “ul” in this context.
United States US