Piecesetpneus.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.
The “navigation” role is unnecessary for element “nav”.
Empty heading.
Errors:
Saw “<?”. Probable cause: Attempt to use an XML processing instruction in HTML. (XML processing instructions are not supported in HTML.)
Bad value “3x” for attribute “id” on element “symbol”: Not a valid XML 1.0 name.
Bad value “4x” for attribute “id” on element “symbol”: Not a valid XML 1.0 name.
Bad value “2x” for attribute “id” on element “symbol”: Not a valid XML 1.0 name.
Bad value “30j” for attribute “id” on element “symbol”: Not a valid XML 1.0 name.
Bad value “30j-v2” for attribute “id” on element “symbol”: Not a valid XML 1.0 name.
Bad value “3x_v2” for attribute “id” on element “symbol”: Not a valid XML 1.0 name.
Stray end tag “head”.
Start tag “body” seen but an element of the same type was already open.
The element “button” must not appear as a descendant of the “a” element.
Attribute “alt” not allowed on element “a” at this point.
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