Melscience.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “stylesheet” for attribute “as” on element “link”.
A “link” element with an “as” attribute must have a “rel” attribute that contains the value “preload”.
Bad start tag in “img” in “head”.
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 “noscript”.
Stray end tag “head”.
Start tag “body” seen but an element of the same type was already open.
Stray end tag “picture”.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Element “source” is missing required attribute “src”.
Warnings:
The “main” role is unnecessary for element “main”.
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
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