Telit.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “” for attribute “media” on element “link”: Media query ended prematurely.
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Start tag “a” seen but an element of the same type was already open.
Stray end tag “a”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Element “dl” is missing a required child element.
Warnings:
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
The “main” role is unnecessary for element “main”.
The “contentinfo” role is unnecessary for element “footer”.
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