Telnyx.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “undefined” for attribute “lang” on element “html”: Subtags must not exceed 8 characters in length.
A document must not include more than one “meta” element with its “name” attribute set to the value “description”.
Bad value “menubar” for attribute “role” on element “nav”.
Bad value for attribute “src” on element “img”: Illegal character in scheme data: space is not allowed.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Attribute “aria-expanded” not allowed on element “div” at this point.
The element “main” must not appear as a descendant of the “article” element.
Element “figcaption” not allowed as child of element “section” in this context. (Suppressing further errors from this subtree.)
Warnings:
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).
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
This document appears to be written in English but the “html” start tag has “lang="undefined"”. Consider using “lang="en"” (or variant) instead.
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