Chitazdrav.ru W3C HTML Markup Validation
HTML markup errors and warnings
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Warnings:
The “banner” role is unnecessary for element “header”.
The “type” attribute is unnecessary for JavaScript resources.
The “main” role is unnecessary for element “main”.
The “complementary” role is unnecessary for element “aside”.
The “navigation” role is unnecessary for element “nav”.
Errors:
The “center” element is obsolete. Use CSS instead.
Attribute “border” not allowed on element “iframe” at this point.
The “allowtransparency” attribute on the “iframe” element is obsolete. Use CSS instead.
The “marginheight” attribute on the “iframe” element is obsolete. Use CSS instead.
The “marginwidth” attribute on the “iframe” element is obsolete. Use CSS instead.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
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