Yabai.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
A “link” element with a “sizes” attribute must have a “rel” attribute that contains the value “icon” or the value “apple-touch-icon”.
Stray end tag “span”.
Bad value “/tag/How to” for attribute “href” on element “a”: Illegal character in path segment: space is not allowed.
Bad value “/tag/Japanese History” for attribute “href” on element “a”: Illegal character in path segment: space is not allowed.
Bad value “/tag/Edo Period” for attribute “href” on element “a”: Illegal character in path segment: space is not allowed.
Bad value “/tag/Feudal Japan” for attribute “href” on element “a”: Illegal character in path segment: space is not allowed.
Bad value “/tag/Learn Japanese” for attribute “href” on element “a”: Illegal character in path segment: space is not allowed.
Bad value “/tag/Ashikaga Shogunate” for attribute “href” on element “a”: Illegal character in path segment: space is not allowed.
Bad value “/tag/Tokugawa Shogunate” for attribute “href” on element “a”: Illegal character in path segment: space is not allowed.
Stray end tag “div”.
Stray end tag “body”.
The “itemprop” attribute was specified, but the element is not a property of any item.
Warnings:
The “banner” role is unnecessary for element “header”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “navigation” role is unnecessary for element “nav”.
The “complementary” role is unnecessary for element “aside”.
The “contentinfo” role is unnecessary for element “footer”.
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