Osapublishing.org W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Attribute “initial-scale” not allowed on element “meta” at this point.
The element “label” must not appear as a descendant of the “button” element.
Bad value “” for attribute “name” on element “input”: Must not be empty.
Element “ul” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Attribute “name” not allowed on element “div” at this point.
Duplicate ID “loginModal”.
Bad value “/images/homepage/OpEx Astrophotonics Published_620x315.jpg” for attribute “src” on element “img”: Illegal character in path segment: space is not allowed.
Bad value “/images/homepage/AO_Near to Mid IR Published_620x315.jpg” for attribute “src” on element “img”: Illegal character in path segment: space is not allowed.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Duplicate attribute “class”.
Bad value “/images\weekly\nov27_17.gif” for attribute “src” on element “img”: Backslash ("\") used as path segment delimiter.
Bad value for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Warnings:
The first occurrence of ID “loginModal” was here.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “form” role is unnecessary for element “form”.
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