Thingsboard.io W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “150px” for attribute “width” on element “iframe”: Expected a digit but saw “p” instead.
Bad value “30px” for attribute “height” on element “iframe”: Expected a digit but saw “p” instead.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
Element “div” not allowed as child of element “button” in this context. (Suppressing further errors from this subtree.)
The element “main” must not appear as a descendant of the “header” element.
The element “main” must not appear as a descendant of the “nav” element.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Stray end tag “img”.
The element “main” must not appear as a descendant of the “footer” element.
Element “style” not allowed as child of element “body” in this context. (Suppressing further errors from this subtree.)
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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