Pptcloud.ru W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “imagepng” for attribute “type” on element “link”: Subtype missing.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
End tag “th” seen, but there were open elements.
Unclosed element “a”.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
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).
The “name” attribute is obsolete. Consider putting an “id” attribute on the nearest container instead.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
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