Rarediseaseday.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”.
Bad value “547acf02b474e01771e83c6a-” for attribute “type” on element “script”: Subtype missing.
Element “fieldset” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Attribute “datetime” not allowed on element “span” at this point.
Stray end tag “a”.
Bad value “https://twitter.com/share?url=https://youtu.be/CLs5Q1XUiUg&via=www.rarediseaseday.org&text=Official rare disease day 2018 video” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Duplicate ID “st1”.
Bad value “” for attribute “id” on element “div”: An ID must not be the empty string.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
The “itemprop” attribute was specified, but the element is not a property of any item.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The “navigation” role is unnecessary for element “nav”.
The first occurrence of ID “st1” was here.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
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