Density.io W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “Access-Control-Allow-Origin” for attribute “http-equiv” on element “meta”.
A document must not include both a “meta” element with an “http-equiv” attribute whose value is “content-type”, and a “meta” element with a “charset” attribute.
Saw “<?”. Probable cause: Attempt to use an XML processing instruction in HTML. (XML processing instructions are not supported in HTML.)
Duplicate ID “table”.
Duplicate ID “wall”.
Duplicate ID “room”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Attribute “maxlength” not allowed on element “input” at this point.
Attribute “maxlength” is only allowed when the input type is “email”, “password”, “search”, “tel”, “text”, or “url”.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Warnings:
The first occurrence of ID “table” was here.
The first occurrence of ID “wall” was here.
The first occurrence of ID “room” was here.
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.
Consider using the “h1” element as a top-level heading only (all “h1” elements are treated as top-level headings by many screen readers and other tools).
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