Schoology.com W3C HTML Markup Validation
HTML markup errors and warnings
(Rescan now...)
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.
Element “font” is missing a required instance of child element “missing-glyph”.
Text not allowed in element “iframe” in this context.
Duplicate ID “logo”.
The element “header” must not appear as a descendant of the “header” element.
Bad value “” for attribute “target” on element “a”: Browsing context name must be at least one character long.
Warnings:
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
The “type” attribute is unnecessary for JavaScript resources.
The first occurrence of ID “logo” was here.
The “navigation” role is unnecessary for element “nav”.
The “main” role is unnecessary for element “main”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
Consider using the “h1” element as a top-level heading only (all “h1” elements are treated as top-level headings by many screen readers and other tools).
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
United States US