Openintro.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”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Bad value “129px” for attribute “height” on element “img”: Expected a digit but saw “p” instead.
Bad value “174px” for attribute “width” on element “img”: Expected a digit but saw “p” instead.
Duplicate ID “mrights”.
Attribute “alt” not allowed on element “div” at this point.
Attribute “alt” not allowed on element “a” at this point.
Warnings:
The first occurrence of ID “mrights” was here.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
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