Accorplus.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “en-cn-tw” for attribute “hreflang” on element “link”: The subtag “tw” does not match the format for any permissible subtag type.
Bad value “en-cn-tw-hk” for attribute “hreflang” on element “link”: The subtag “tw” does not match the format for any permissible subtag type.
Bad value “en-cn-tw-hk-mo” for attribute “hreflang” on element “link”: The subtag “tw” does not match the format for any permissible subtag type.
Bad value “zh-cn-tw” for attribute “hreflang” on element “link”: The subtag “tw” does not match the format for any permissible subtag type.
Bad value “zh-cn-tw-hk” for attribute “hreflang” on element “link”: The subtag “tw” does not match the format for any permissible subtag type.
Bad value “zh-cn-tw-hk-mo” for attribute “hreflang” on element “link”: The subtag “tw” does not match the format for any permissible subtag type.
A “charset” attribute on a “meta” element found after the first 1024 bytes.
Bad value “navigation” for attribute “role” on element “header”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
The “aria-labelledby” attribute must point to an element in the same document.
Warnings:
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
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