Hepb.org W3C HTML Markup Validation
HTML markup errors and warnings
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Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The first occurrence of ID “nav2” was here.
The first occurrence of ID “nav3” was here.
The first occurrence of ID “nav10” was here.
The first occurrence of ID “nav11” was here.
The “name” attribute is obsolete. Consider putting an “id” attribute on the nearest container instead.
Errors:
A document must not include both a “meta” element with an “http-equiv” attribute whose value is “content-type”, and a “meta” element with a “charset” attribute.
A document must not include more than one “meta” element with a “http-equiv” attribute whose value is “content-type”.
Attribute “heading” not allowed on element “a” at this point.
Duplicate ID “nav2”.
Duplicate ID “nav3”.
Duplicate ID “nav10”.
Duplicate ID “nav11”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
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