Achain.com W3C HTML Markup Validation
HTML markup errors and warnings
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Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
Empty heading.
The “type” attribute is unnecessary for JavaScript resources.
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).
Errors:
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
“=” at the start of an unquoted attribute value. Probable cause: Stray duplicate equals sign.
“"” in an unquoted attribute value. Probable causes: Attributes running together or a URL query string in an unquoted attribute value.
End tag “section” seen, but there were open elements.
Unclosed element “div”.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
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