Richtabor.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Attribute “href” not allowed on element “use” at this point.
Element “button” is missing one or more of the following attributes: “type”.
Attribute “atl” not allowed on element “a” at this point.
Attribute “version” not allowed on element “symbol” at this point.
Attribute “x” not allowed on element “symbol” at this point.
Attribute “y” not allowed on element “symbol” at this point.
Attribute “width” not allowed on element “symbol” at this point.
Attribute “height” not allowed on element “symbol” at this point.
Duplicate ID “Shape”.
The “aria-controls” attribute must point to an element in the same document.
The “itemprop” attribute was specified, but the element is not a property of any item.
Warnings:
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
The “main” role is unnecessary for element “main”.
Empty heading.
The “complementary” role is unnecessary for element “aside”.
Unsupported SVG version specified. This validator only supports SVG 1.1. The recommended way to suppress this warning is to remove the “version” attribute altogether.
The first occurrence of ID “Shape” was here.
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