Nonprofithub.org W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
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.
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Bad value “” for attribute “width” on element “img”: The empty string is not a valid non-negative integer.
Bad value “” for attribute “height” on element “img”: The empty string is not a valid non-negative integer.
Element “p” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Bad value “_rss” for attribute “target” on element “a”: Reserved keyword “rss” used.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
The “center” element is obsolete. Use CSS instead.
Bad value “100%” for attribute “width” on element “iframe”: Expected a digit but saw “%” instead.
Attribute “type” not allowed on element “iframe” at this point.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The “allowtransparency” attribute on the “iframe” element is obsolete. Use CSS instead.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
Text not allowed in element “iframe” in this context.
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